Some chemists believe that satisfaction of the octet rule should be the top criterion for choosing the dominant Lewis structure of a molecule or ion. Other chemists believe that achieving the best formal charges should be the top criterion. Consider the dihydrogen phosphate ion, HaPO. , in which the H atoms are bonded to O atoms. (a) What is the predicted dominant Lewis structure if satisfying the octet rule is the top criterion? (b) What is the predicted dominant Lewis structure if achieving the best formal charges is the top criterion?

1. Write Lewis symbols for the following atoms. (1pt each) (a) Kr (b) Ge (c) N (d) Ga (e) As (f) Rb 2. Write plausible Lewis structures for the following molecules that contain only single covalent bonds. (2 pts each) (а) FCI (b) I2 (c) SF2 (d) NF3 (е) Н-Те 3. By means of Lewis structures, represent bonding between the following pairs of elements (Your structures should show whether the bonding is essentially ionic or covalent): (2 pts each) (a) Cs and Br (b) H and Sb (c) B and Cl (d) Cs and Cl (e) Li and O (f) Cl and I 4. Assign formal charges to each of the atoms in the following structures. (3 pts each) (a) [H–C=C:]¯ (c) [CH3–CH-CH3]* (b) |2– :0: :0: 5. What is the formal charge of the indicated atom in each of the following structures? (2 pts each) (a) the central O atom in 03 (b) Al in AIH4- (c) Cl in Cl03 (d) Si in SiF62- (e) Cl in CIF3 6. Arrange the following elements in the order of decreasing electronegativity: fluorine, bromine, lithium, francium, silicon. (1 pt each per…

Draw the most stable Lewis's diagram for 2RO; that follows the octet rules and include the formal charges

The completed Lewis structure of (CO3)2- contains a total of covalent bonds and lone pairs. Consider only a resonance structure in which all atoms have full octets. NOTE: If applicable, expand octets on relevant atoms to reduce formal charge as much as possible. NOTE: A double bond counts as "2 covalent bonds" for the purposes of this question.

The formal charge is the "charge" an element would have in a molecule or ion if all of the bonding electrons were shared equally between atoms. :Ö-As=0 Based on the Lewis structure given, the formal charge on the central arsenic atom is

Write Lewis structures for the following: (a) H2CO (bothH atoms are bonded to C), (b) H2O2, (c) C2F6 (containsa C¬C bond), (d) AsO33 - , (e) H2SO3 (H is bonded to O),(f) NH2Cl

Consider the chemical equation. N(g) + NO(g) = NNO(g) Write Lewis formulas for the reactant and product species in the chemical equation. Include nonbonding electrons.

Which of these molecules has a Lewis structure with a central atom having no nonbonding electron pairs? (a) CO2, (b) H2S, (c) PF3, (d) SiF4, (e) more than one of a, b, c, d.

Write Lewis structures for the following molecules and ions:   (a) NCl3, (b) OCS, (c) H2O2

A new element, Bw, has been identified to be part of Period 10 Group VIIA. Draw the proper structure of the polyatomic ion, BwCl2S3 ^ - . According to VSEPR theory, this ion has a molecular shape of [1]. (Type the shape exactly as written on the table provided to you on the exam data sheet) The formal charge of the Bw atom must be [2]. (Type in the charge including a sign and numberi.e. +1, -1, -2, +2, 0, etc.)