What is the main difference between monatomic and polyatomic ions.

Monoatomic has one atom, polyatomic has many atoms.

Work Cited:
http://wiki.answers.com/Q/Difference_between_monoatomic_ions_and_polyatomic_ions

A class mate insists that sodium gains a postive charge when it becomes an ion because it gains a proton. Explain the students error.

The students error is you would lose an electron, not gain a proton. It's always the opposite, if there's a positive charge, you lose an electron, negative charge, gain a proton.

Why are most metals found in nature as ores that need refining and not as pure metals?

Metals are reactive and can have a more stable configuration by forming compounds.

Work Cited:
http://answers.yahoo.com/question/index?qid=20071024115125AAbVerr

Under the right conditions ionic substances can conduct electricity very well. Describe these conditions and explain why an ionic substance would be a poor choice as a conductor for a computer circuit board.

They are absorbed in water. They'd be a bad choice for a circuit board because they don't work in water.

Work Cited:
http://wiki.answers.com/Q/In_what_conditions_do_ionic_compounds_conduct_the_best_electricity

Name two properties of metals and explain each in terms of the bonding model for metals.

High melting points
High densities

These would effect the bonding because they both have high melting points so if they bonded by melting, it would take longer. Their densities would also effect their overall product.

Work Cited:
http://chemistry.about.com/od/elementgroups/a/metals.htm

Using the formula of a compound. how might we determine whether or not its ionic.

Ions need to have a full octet, if there is two elements that can either be positive or negative then one needs to gain an electron so it can act like the nearest noble gas, while the other needs to lose an electrons. Then they will react and make an ionic compound.

Describe the attractive and repulsive forces that occur as two atoms are brought closer together.

When two atoms are brought closer together the attraction pulls the electrons from one atom with the other atom's nucleus. Then they become balanced because of the repulsive force that makes them have a positive charge when they are pulled together.

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

Compare the behavior of bonding electrons in a non-polar covalent bond with that of bonding electrons in a polar covalent bond.

When a chemical bond is formed the atom will become more stable. It depends on the bond whether it will gain or loose electrons because of the energy it gives off. Ionic bonds have more energy because of the movement between electrons.

Work Cited:
www.science.kennes.edu

How might changing the shape of a molecule affect its properties?

Changing the shape of the molecule effects its properties in many ways such as changing its melting and boiling point and changing how it reacts.