Predict the molecular shape of Br2 and Hbr.

They both are linear because they both have only three elements.

Why do ionic compounds ordinarily have such high melting and boiling points?

The reason why ionic compounds have high melting and boiling points is because of their physical properties. When the compound has high heat it will break the bond. For example Sodium chloride is an ionic compound, because of its electrostatic attraction it takes a lot of heat energy. The difference between different copounds depends on the charge and the size of the ion.

Work Cited:
www.chemguide.co.uk/atoms/structures/ionicstruct.html.

What are anions?

They are negatively charged Ions. When naming the element or compound the anion is the second one listed because its a nonmetal. The charges for anions are -1, -2, -3, -4.

What are cations?

Cations are positively charged ions. When naming the element or compound the cation is the first one listed because its more often times a metal. The charges that cations have are +1 , +2 , +3 , +4 .

Are ions stable?

All Ions aren't stable because they need a full even shell to be stable. You can use the Bohr structure to show you the ions are stable.

The electron configurations for...

a. Calcium , Ca.
[ Ar ] 4s2
b. Oxygen , O.
[He] 2s2 2p4
c.) Iodine ,I
 [Kr] 4d10 5s2 5p5
d.) Xenon, Xe
[Kr] 4d10 5s2 5p6

What happens to the stability and energy of two atoms as they form a covalent bond?

Covalent bonds release energy when two atoms come together. This makes the electron more stable.

Work Cited:
www.chacha.com