I need Help On Integrated Science!Can anyone?

Question

We are doing elements in this class.
And i need major help!!I was listening in class,I just dont get it.
But here is a problem i need help on.

Directions: Classify the following compounds as Ionic(Metals && NonMetals), Covalent (metals or nonmetals) or both (compounds containing the polyatomic Ion. )


Note: Parentaseth[sp] is for the Charge.
or the OPPOSITE of Powers.
1.) CaCl(2)
2.)Co(2)
3.)H(2)O
4.)BaSO(4)

Can someone atleast explain this to me??
Thanks.
Amanda

Answer 1

Metals tend to be in the left two-thirds of the periodic table. Nonmetals tend to be in the right one-third. Metals and nonmetals tend to form ionic compounds. Nonmetals tnd to form covalent compounds with one another.

1. CaCl2 is ionic, because Ca is on the far left and Cl on the far right.

2. Co 2+ is a metal ion from the center.

3. H2O is covalent. O is on the far right. H is a toughie, because it has properties of metals and nonmetals. But this time it's covalent.

4. BaSO4 is both, because it has the Ba2+ ion from the far left and the SO4= polyatomic ion.