It should be noted that while there is a compound with the general formula TlI 3, it is actually a thallium (I) compound of I 3-. ChemSpider ID 6116. In the BI3 Lewis structure, a total of 18 nonbonding electrons and 6 bonded electrons are present. Hence, according to lewis acid-base theory, as Boron accepts lone pair of electrons, so it acts as a lewis acid. The Lewis Dot Structure will show you one Boron atom with three electrons in its last shell and three Fluorine atoms with seven electrons in its last shell. Jay is an educator and has helped more than 100,000 students in their studies by providing simple and easy explanations on different science-related topics. 4. To draw a Lewis Structure of BF3 molecule, start by adding electrons and connecting them. A simple example of Lewis acid-base complexation involves ammonia and boron trifluoride. Boron resides in group 13 of the periodic table, boasting three valence electrons, while each fluorine atom originates from group 17, contributing seven valence electrons. #2 Show chemical bond. Draw the Lewis structure of each compound to. The hybridization of boron in BF 3 is sp 2. The reaction between ammonia and boron trifluoride is shown below. Boron requires only 6 electrons rather than 8 to make an octron. Following the Octet Rule for Lewis Dot Structures leads to the most accurate depictions of stable molecular and atomic structures and because of this we always want to use the octet rule when drawing Lewis Dot Structures. Boron can complete its octet if another atom can provide both the electrons and is a lone pair acceptor (Lewis acid). , fluorine. Lewis Structures. Lewis structure of boron trifluoride (BF 3) is shown below and you can see each fluorine atom has made a single bond with boron atom. It is bonded to 2 O-atoms via single covalent bonds and to 1 O-atom via a double covalent bond. . Check me out: Lewis Structure. Only one of the empty p-orbital is left. ”. The computation will end with 24 total valence electrons, forming. XeF 4 is the chemical formula for xenon tetrafluoride, the first discovered binary compound of a noble gas. Para formar un octeto, un boro necesita ocho electrones de valencia. If you haven’t understood anything from the above image of BF3 lewis structure, then just stick with me and you will get the detailed step by step explanation. The central atom of this. This acid-base reaction allows boron (which is electron-deficient in BF 3) to complete its octet. 3 °C. molecular geometry e. f) Br. In. 96 and 3. Understanding the molecular structure of a compound can help determine the polarity, reactivity, phase of matter, color, magnetism, as well as the biological activity. Add electrons (3*7) + 3 = 24. lines; lines lines; dots dots; lines, Resonance structures are Lewis structures that have the. Lewis Structure of Boron Trifluoride . Molecular geometry, also known as the molecular structure, is the three-dimensional structure or arrangement of atoms in a molecule. Count all of its lone pair electrons, and half of its bonding electrons. BF3, which is commonly referred to as boron trifluoride, is a molecule that covalently bonds that has trigonal planar molecular geometry. Example: Consider boron trifluoride (BF 3) which contains 24 valence electrons. The hybridization of boron in BH 3 is sp 2. . Bond distances are measured in Ångstroms (1 Å = 10 –10 m) or picometers (1 pm = 10 –12 m, 100 pm = 1 Å). Step-by-Step Guide to Drawing the Lewis Structure of BF3 1. 7. Which is the correct Lewis Structure? inorganic-chemistry. The molecular weight of this compound is calculated to be 108. Bonding pairs of electrons engage in the formation of bonds, whereas nonbonding pairs of electrons, also known as lone. In the BrF3 Lewis structure, there are three fluorine atoms bonded to a central bromine atom. There are three covalent bonds in the most reasonable skeleton structure for the molecule. Fluorine is also a halogen element like chlorine. Resonance structures are used when a single Lewis structure cannot fully. e. For example, AX2E2 is shown as the formula for water (H2O), which has two bonded hydrogen atoms ("X") and two lone (unbonded) electron. Let’s focus one the following topics. Find the least electronegative atom and placed it at center. Each fluorine atom starts with seven valence electrons and uses only one of them to bond. For the SO4 2- structure use the periodic table to find the total numb. The Lewis base is (CH 3) 2 S, and the Lewis acid is BH 3. We start with the Lewis Structure and look and. IUPAC Standard InChI:InChI=1S/BF3/c2-1 (3)4. An example is the reaction of ammonia with boron trifluoride. Atoms of boron follow a sextet rule. NF3 lewis dot structure contains 1 lone pair and 3 bonded pairs. 4 (amidase) inhibitor, an algal metabolite and an Escherichia coli metabolite. The Lewis structure for (ce{BF3}) includes several resonance structures. E(B) – N. The highly polarized B-F bond has a dipole moment that lies opposite to the. Figure 1. Step #1: Calculate the total number of valence electrons. In valence electron is one of the outer shells of an atom created during chemical bond synthesis. Boron trifluoride dihydrate is a fuming liquid. You can calculate the formal charges if you are not sure that you simply have an optimum. f) Br. The polarity of each B-F bond gets canceled. (ii) Identify the type of hybridization exhibited by sulfur in the SF 3 + cation. The five simple steps are:1. (iii) Identify the geometry of the SF 3 + cation that is consistent with the Lewis structure drawn in part (a. Geometry of Molecules. Geometry of Molecules. The valency of B (Boron) is 3 and of F (Fluorine) is 7, thus the Lewis structure of BF3 can be drawn as shown in the figure: As shown in Table 6. For the BF3 structure use the periodic table to find the total numb. PF3 is a tetra-atomic molecule where phosphorus donates three valence electrons, and three fluorine atoms accept one electron each to undergo a bond. It is commonly used in biochemistry. The molecular geometry or shape of NO 2– is bent or V-shaped. Resonance is a mental exercise within the Valence Bond Theory of bonding that describes the delocalization of electrons within molecules. . The Lewis structure theory does not comprehend the shape of a molecule. These pairs of electrons present between the Carbon & Chlorine. The Lewis structure helps us understand the bonding and electron distribution in a molecule. Drawing The Lewis Structure of BF3. . e) N. Learn the steps to draw the Lewis Structure of BF3 in just 1 minute. Is BF3 likely to be an electrophile or a nucleophile? Draw a Lewis structure for BF3, and explain the result. write the chemistry for the lewis acid/ base reaction between Nh3 and BF3 using lewis structures and clearly identifying the lewis acid and lewis base. $endgroup$Chemistry questions and answers. The bond angle of CS2 is 180º. 50. A step-by-step explanation of how to draw the SO4 2- Lewis Dot Structure (Sulfate ion). Exceptions to the Octet Rule. A. . 2. Use as a Lewis acid catalyst for alkylation of aromatic compounds; use in polymer technology in manufacture of phenolic. Boron trifluoride, B F 3. Beginning with the n=3 principle quantum number, the d orbitals become available ( l =2). Acidic substances liberate H + ions in an. Solve any question of Chemical Bonding and Molecular Structure with:-. NaCl, BF3, CaCl2, N2O, P4O6, FeS and CBr4. In BF3, Boron is the least electronegative atom and will be used as the central atom. Draw a Lewis structure for each of the following: 4. Structure and bonding The geometry of a molecule of BF3 is trigonal planar. A Lewis diagram shows how the valence electrons are distributed around the atoms in a molecule. Boron trifluoride. a lithium hydroxide solution is added and a precipitate forms almost immediately; dxplainWrite the singly bonded Lewis dot… | bartleby. SF4 Lewis Structure, Molecular Geometry, Hybridization, and MO Diagram. A molecule of nitrogen dioxide consists of one nitrogen atom and two atoms of oxygen. In PCl 5, axial atoms (2 P-Cl bonds) make a 90º angle with the plane, and equatorial atoms (3 P-Cl bonds) make a. F2 + I2 ——> IF3 at −45 °C in CCl3F. Beryllium (Be) is a bit of an exception and is okay with only. The BCl₃ lewis structure is analogous to the BF ₃ (Boron Trifluoride) and BBr ₃ (Boron Tribromide) as F and Br falls in group 7 and includes 7 valence electrons. Draw the Lewis structure for each one and then describe the electron-pair geometry and the molecular geometry. Boron trifluoride, BF 3 acts as a Lewis acid when it combines with a basic ion or molecule that can donate an electron pair. Verified by Toppr. Answer choice (D) is the only Lewis structure that shows three single covalent bonds and. The 'octet' rule is based upon available n s and n p orbitals for valence electrons (2 electrons in the s orbitals, and 6 in the p orbitals). For example, in the Lewis structures of beryllium dihydride, BeH 2, and boron trifluoride, BF 3, the beryllium and boron atoms each have only four and six electrons, respectively. 1. The best Lewis structure for BF3 is one with three B-F single bonds, satisfying the octet rule. Add octets to outer atoms: 4. Valence electrons of carbon atom = 4. Draw the final NH 3 BF 3 lewis structure: Lewis structures are not very good at describing boron-containing compounds and ions. The Lewis structure of H 2 O indicates that there are four regions of high electron density around the oxygen atom: two lone pairs and two chemical bonds: Figure (PageIndex{9}). The VSEPR theory assumes that each atom in a molecule will achieve a geometry that minimizes the repulsion between electrons in the valence shell of. BF3 Lewis Structure. Add electrons (3*7) + 3 = 24. . Let’s discuss each step in more detail. He is a founder of Pediabay and is passionate about helping students through his easily digestible explanations. (Chem 1090 Lewis 7b) Steps. this is the complete Lewis structure of CO 2. The actual electronic structure is not just a single Lewis structure but a combination of multiple contributing structures, some of which do satisfy the octet rule and some of which don't. 2. It is a Lewis acid, and to further check its prop. It has less than an octet on at least one atom. \[\ce{BF3 + F^{-} <=> BF4^{-} Here, the acid is BF 3 and the base is F-. A step-by-step explanation of how to draw the CCl4 Lewis Dot Structure (Carbon tetrachloride). Ammonia reacts with boron trifluoride to form a stable compound, as we saw in Section 8. The total valence electrons available for drawing nitrite [NO2]– ion Lewis structure are 18. Such a reaction is shown below. Each fluorine has three lone pairs, Bromine has two lone pairs. 1. CAS Registry Number: 7637-07-2. For example, if we want to obtain the Lewis structure of the Sulfate ion, SO 4 – 2, we must first enter the. Thus, the Lewis dot symbol for N is. BrF3 Lewis Structure. Count the total valence electrons present in BF4–. ∙ 10y ago. if it is led to decomposition. For the I3 - structure use the periodic table to find the total number. SIF4 is a covalent compound, which consists of silicon and fluorine atoms. In the CH 2 F 2 lewis structure, a total of 6 lone pairs and 4 bond pairs are present. In this article, we’ll look at what we know about the Lewis shape of BF3 and assist us in understanding its properties and behavior. To sketch the NO2+ Lewis structure by following these instructions: Step-1: NO2+ Lewis dot Structure by counting valence electrons on the nitrogen atom. The boron has no octet and is an electron acceptor. 14). Hey Guys,Today we are going to look at the Lewis Structure of BrF3 which is a chemical formula for Bromine Trifluoride. Expert Answer. . In PCl 3 lewis structure, each chlorine atom is joint with center phosphorus atom through a single bond. The difference between the atom's number of valence electrons and the number it owns is the formal charge. The Lewis structures for the given particles are as follows: A. This structure also shows some double bond character due to the B-F bonds being slightly shorter than expected. σ framework π-bond Overall structure Question: Identify the σ framework and the π-bonds in acetylene, C2H2, H-C≡C-H. Both structures (2 and 3) must be used to represent the molecule’s structure. . The fluorine atom has s and p orbital. Give the name of the electronic arrangement and the name for the molecular geometry for each of the species. . The overall valence electrons of fluorine and bromine in the Lewis Structure of BrF3 are seven. 0. 02 which is greater than 0. ∴ Total valence electron available for BrF5 lewis structure = 7 + 7*5 = 42 electrons [∴BrF5 has 5 fluorine atom and 1 bromine ] 2. The Valence Bond Theory is usually represented by the Lewis dot models. This compound is called a Lewis acid-base complex. The electron geometry of PF 5 is also Trigonal bipyramidal. BF3 does not have any lone pairs of electrons, and its molecule is nonpolar. It consists of one Beryllium and two Fluorine atoms. Each fluorine atom starts with seven valence electrons and uses only one of them to bond. Oxygen belongs to group 16 ( or group 6) and has an atomic number of 8, therefore a. F is the atom with the highest electronegativity; therefore, F has “+” formal charge in any plausible Lewis structure! CH 3 +: This is another reactive intermediate in organic reactions (this is further discussed in Chapter 8). Question: 1. BI3 is nonpolar and has Sp 2 hybridization. Lewis symbol: symbol for an element or monatomic ion that uses a dot to represent each valence electron in the element or ion. ∴ Total valence electron available for BrF5 lewis structure = 7 + 7*5 = 42 electrons [∴BrF5 has 5 fluorine atom and 1 bromine ] 2. The VSEPR model assumes that electron pairs in the valence shell of. There are currently 5 valence electrons around the nitrogen. . There is no lone pair of electrons on the central N-atom. The quick answer is, “There are no pi bonds in "BF"_3", but the answer isn't quite that simple. Page ID. Figure 10. For the NH3 structure use the periodic table to find the total number of vale. For Lewis structure purposes, the lone-pairs can only be moved from terminal atoms to the central atom to form multiple bonds, not the other way around. In the third step, determine the number of bonds in both atoms. The approx bond angle in CH 2 F 2 is based on the type of bond, ∠F-C-H = 109º, ∠H-C-H = 113º, ∠F-C-F = 108. For example, in the Lewis structures of beryllium dihydride, BeH 2, and boron trifluoride, BF 3, the beryllium and boron atoms each have only four and six electrons, respectively. 2j BH3 molecule Lewis structure. The BF 3 molecule has 1 atom of Boron and 3 atoms of Fluorine. The boron atom in boron trifluoride, BF 3, has only six electrons in its valence shell. VSEPR calculation for boron trifluoride, B F 3. Chemistry. 6. Answer 1 Both the Arrhenius and Bronsted lowry theory of acid and bases define on acid as a hydrogen ion ( proton) donor . Bf3 Lewis Structure. Count all of its lone pair electrons, and half of its bonding electrons. In general, all legitimate resonance structures for a given molecule will have the same number of double bonds. , have the same hybridization at the central atom)? CH4 HCN NH3 BF3Visit ChemicalBook To find more Boron trifluoride(7637-07-2) information like chemical properties,Structure,melting point,boiling point,density,molecular formula,molecular weight, physical properties,toxicity information,customs codes. This is the Lewis electron structure of nitrosyl chloride, a highly corrosive, reddish-orange gas. Hint: draw out a proper Lewis structure, showing any lone pairs of electrons. Put the following molecules in order of decreasing F-X-F bond angle, where X is the central atom. Beryllium fluoride (BeF2) lewis dot structure, molecular geometry, electron geometry, polar or nonpolar, bond angle. Remainder of electrons (11-8 = 3) on "central" atom: 5. Prediction based on Lewis structure: The Lewis electron dot structures are shown below for BeX 2, where X is one of the halogens, F or Cl. Is BF3 likely to be an electrophile or a nucleophile? Draw a Lewis structure for BF3, and explain the result. Transition Metals and Coordination Compounds 1h 52m. For the I3 - structure use the periodic table to find the total number. A quick explanation of the molecular geometry of PF3 including a description of the PF3 bond angles. Step #1: Calculate the total number of valence electrons. The Lewis structure for (ce{BF3}) includes several resonance structures. The hybridization of phosphorous in PF 5 is sp 3 d. (CC BY-NC; CK-12) Boron trifluoride is the Lewis acid, while ammonia is again the Lewis base. , Boron. Chemistry - Basic Introduction:. Thus, the Lewis dot symbol for O is. The atomic S – orbitals and P –. {eq}BF_3 {/eq} consists of a boron atom that is single-bonded to three fluorine atoms. When we draw the lewis structure for BF3, we'll see that there aren't enough electrons available to complete Boron's octet and it only has 6 electrons in the BF3 lewis structure. Beryllium fluoride is an inorganic compound that appears as colorless lumps have a chemical formula BeF2. The hybridization of phosphorous in PCl 5 is sp 3 d. In the PCl 5 Lewis dot structure, a total of 15 lone pairs and 5 bond pairs are present. {eq}BF_3 {/eq} consists of a boron atom that is single-bonded to three fluorine atoms. The molecular geometry or shape of NO 2– is bent or V-shaped. Other names: Borane, trifluoro-; Boron fluoride (BF3); Boron fluoride; Trifluoroborane; Trifluoroboron; BF3; Fluorure de bore; UN 1008; Anca 1040. An explanation of the molecular geometry for the BrF3 (Bromine trifluoride) including a description of the BrF3 bond angles. In this case, in principle one of the lone pairs of a terminal fluorine atom could be moved to form a double bond to complete an octet for boron (Lewis structure labeled (ii), below). I2 + 3XeF2 ——> 2IF3 + 3Xe. Draw the Lewis structure of each compound to. A step-by-step explanation of how to draw the BrF3 Lewis Dot Structure (Boron trifluoride ). It is corrosive in nature. SF4 molecule consists of a total of 34 valence electrons; Density = 1. Bromine trifluoride represented by the formula BrF 3 is an interhalogen chemical compound that appears as a yellowish, fuming liquid with a pungent odor. Cite. The Lewis dot structure of BF3 shows that boron has three valence electrons, and each fluorine atom contributes one electron. 12. 5°. Then we find the number of electrons by which an atom forms a bond. 806. 1. The melting and boiling point of silicon tetrafluoride is -95. 14. It is possible to draw a structure with a double bond between a boron atom and a fluorine atom in BF 3 , satisfying the octet rule, but experimental evidence. If we add this one boron and three fluorine atoms of the BF3 molecule, there are 24 electrons here in the BF3 molecular. XeF4 iii. Jay Rana . Rules to draw BF3 Lewis structure: Before drawing the Lewis structure, it is necessary to understand the rule to draw Lewis structure. Use this. Lewis structure of NH 3 can be drawn by starting from valence electrons of nitrogen and hydrogen atoms in several steps. The molecular geometry of ammonia (NH3) is trigonal pyramidal or a distorted tetrahedral. (Note: If you want to know the steps of drawing the AsCl3 lewis dot structure, then visit this article: AsCl3 lewis structure , Or you can also watch this short 2 minute video). . Show the formal charges and oxidation numbers of the atoms. Correct option is A) BF 3: In above structure, 'F' completes its octet by sharing one electron from 'Boron' While 'Boron' shares three electron from three 'F' atom and has only 6 electrons in outermost cell thus it has an incomplete octet. A video tutorial on how to draw the Lewis structure of boron trifluoride (BF3), a covalent molecule with 24 valence electrons. It may be corrosive to skin, eyes and mucous membranes. number of non-binding electrons e. F2 + I2 ——> IF3 at −45 °C in CCl3F. For example, in NH 3, N has 1 lone pair (2 electrons) and 3. It involves constructing multiple Lewis structures that, when combined, represent the full electronic structure of the molecule. 3Cl = 7*3=21. Show the formal charges and oxidation numbers of the atoms. There are 3 single bonds between the Boron atom (B) and. 1. The central N-atom has sp 2 hybridization in NO 2–. Study with Quizlet and memorize flashcards containing terms like In which of the molecules below is the carbon-carbon distance the shortest? A) H2C CH2 B) H-C≡C-H C) H3C-CH3 D) H2C C CH2 E) H3C-CH2-C H3, The Lewis structure of N2H2 shows _____. From the Lewis dot structure of BrF5, it is clear that the electron geometry of the molecule is octahedral where the electronegativity values of bromine and fluorine are 2. Let’s discuss each step in more detail. A step-by-step explanation of how to draw the NF3 Lewis Dot Structure (Nitrogen trifluoride). #2 Show chemical bond. Boron trifluoride. NF3 is polar in nature. #2 Mark lone pairs on the atoms. BCl ₃ Lewis Structure. 1. Beginning with the n=3 principle quantum number, the d orbitals become available ( l =2). Now in the above sketch of CH3Cl molecule, put the two electrons (i. So, the valence electron for bromine is 7 and for fluorine, it is also 7 as both belong to the same group in the periodic table. For example, in the Lewis structures of beryllium dihydride, BeH 2, and boron trifluoride, BF 3, the beryllium and boron atoms each have only four and six electrons, respectively. e. Boron trifluoride is a boron fluoride. In BF3, Boron is the least electronegative atom and will be used as the central atom. In PCl 3 lewis structure, each chlorine atom is joint with center phosphorus atom through a single bond. The molecular geometry or shape of PF 5 is a Trigonal bipyramidal. Xenon tetrafluoride (XeF4) Lewis dot structure, molecular geometry or shape, electron geometry, bond angle, formal charge, hybridization. Boron trifluoride is utilized. Visita nu. Each B-F bond is polar due to a difference in electronegativity between the central boron and each halogen i. The highly polarized B-F bond has a dipole moment that lies opposite to the. Moreover, as there exist sigma bonds only and one 2s and three 2p orbitals of the carbon produce four new hybrid orbitals, the hybridization of CH4 is sp3. BC13 reacts with BC13 reacts with NH, in a similar way as BF. b. When there are lone pairs, you need to look at the structure and recognize the names and bond angles. Boron trifluoride was a Lewis acid whereas the Lewis base was ammonia because of the presence of lone pairs on the nitrogen atom. . This would be the structure of HCO 2 3–. BF 3 (boron trifluoride) has one boron atom and three fluorine atoms. i. What is the molecular shape of BF3? O Trigonal planar O Bent O Trigonal pyramidal O Tetrahedral O Linear The B-F bond in BF is Select. The structure below is also incorrect, but for a different reason. Thus, the electron-pair geometry is tetrahedral and the molecular structure is bent with an angle slightly less than 109. . Octet on "outer" element: 4. 4). When there are no lone pairs the molecular geometry is the electron (VESPR) geometry. non-polar. A step-by-step explanation of how to draw the NF3 Lewis Dot Structure (Nitrogen trifluoride). The molar mass of IF3 is 183. Any given atom follows the octet rule, although there are some exceptions to this rule. • Include all valence lone pairs in. The oxygen atom contains only 6 valence electrons. (i) Describe the structure of each allotrope. Beryllium fluoride is an inorganic compound that appears as colorless lumps have a chemical formula BeF2. The electron geometry of PCl 5 is also Trigonal bipyramidal. ClO 4– is the chemical formula for the perchlorate ion. Add extra electrons (24-24=0) to central atom:Boron trifluoride | BF3 | CID 6356 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. In. All these characteristics help in determining other properties of the molecule. Therefore, B needs 2 more electrons to complete the octet. The melting and boiling point of silicon tetrafluoride is -95. Also, there is a lone pair on phosphorus atom. The molar mass of IF3 is 183. The boron atom forms three covalent bonds with the fluorine atoms, resulting in a trigonal planar molecular geometry. In this video, we are going to draw the Lewis structure for BF₃, boron trifluoride. Draw and explain the Lewis dot structure of boron. Question: Put the following molecules in order of decreasing F-X-F bond angle, where X is the central atom. a. BF3 Draw the Lewis structure for BF3 in the box at the right, including lone pairs. Step #1: Calculate the total number of valence electrons. XeF4 iii. One last example is boron trifluoride. Final answer. Draw the Lewis structure of the 1:1 adduct that forms in the Lewis acid-base reaction between boron trifluoride (BF3) and dimethyl ether (CH3)20). Figure (PageIndex{2}): Ammonia and boron trifluoride. The formal charges of the SO 2 with the single bond and a double bond is larger than the SO 2 with two double bonds. When breathed, boron trifluoride is extremely poisonous. 3. Re: BF3 lewis dot structure. Explicitly draw all H atoms. Six electrons implies three electron pairs and therefore a trigonal geometry. They both have seven electrons in the outer shells as well. 0 °C and -90. 21, CO 2 accepts a pair of electrons from the O 2− ion in CaO to form the carbonate ion. Draw a Lewis structure for BF3, and explain your answer. So I would assume that the one with two double bonds is the correct structure. Bromine trifluoride (BrF3) Lewis dot structure, molecular geometry or shape, electron geometry, bond angle, formal charges, hybridization, polar vs non-polar. If the. 5 degree The B- F bond in BF_3 is The molecule of BF_3 is What is the name of BF_3?. (Valence electrons are the number of electrons present in the outermost shell of an atom). In the lewis structure of the BF₃ molecule, all these electrons have to be drawn around the central atom i. If we add this one boron and three fluorine atoms of the BF3 molecule, there are 24 electrons here in the BF3 molecular. Table 6. . Sometimes one Lewis Structure is not Enough . BF3 lewis structure has a Boron atom (B) at the center which is surrounded by three Fluorine atoms (F). You can also browse global suppliers,vendor,prices,Price,manufacturers of Boron. However, for aluminum and the heavier Group 13 elements, more than one ligand can. 14. The 'octet' rule is based upon available n s and n p orbitals for valence electrons (2 electrons in the s orbitals, and 6 in the p orbitals). 1 6. Hence, according to lewis acid-base theory, as Boron accepts lone pair of electrons, so it acts as a lewis acid. The orbital diagram for the valence shell of phosphorous is: Hence, the third period elements occasionally.