10 CHAPTER: HW

how many bonding electrons and lone pair electrons (nonbonding electrons) are there in the Lewis structure of HCN?

8,2

How many electrons are transferred between the cation and anion to form the ionic bond in one formula unit of? KBr CaS LiF NaCl BaO

1 2 1 1 2

1) Do the alkali metals tend to gain or lose electrons in chemical reactions? 2) How many?

1) Tend to lose 2) 10

For neutral molecules, which statements about covalent Lewis structures are true?: 1. Hydrogen atoms are often the central atom of a Lewis structure. 2. Each atom of a Lewis structure must have eight electrons. 3. For a neutral molecule, the number of electrons in the Lewis structure is the sum of the valence electrons for the atoms. 4. Electrons of covalent compounds may be shared between atoms.

1. False. Hydrogen atoms can only ever have 2 valence electrons. That is because the first energy level has no p orbitals. 2. False. Hydrogen is a counter-example. 3. True. 4. True. That's the definition of a covalent compound.

A covalent compound is composed of a nitrogen atom, a hydrogen atom, and a carbon atom. How many electrons should the Lewis structure of the covalent compound contain?

10

Which nonmetals could form an ionic compound with magnesium with the formula MgX2 (where X represents the nonmetal)?

MgF2 MgCl2 MgBr2 MgS MgO MgN