general questions, any help appreciated

Fev2Ov3(s) + 3Hv2(g) = 2Fe(s) + 3Hv2O(g) im pretty sure i have 2Fe, 3O and 5H on either side now.

Next i need to find out what non-metal anion is been represented here (it has a charge of ^-2) 1s^2 2s^2 2p^6 3s^2 3p^6. i get the subshells and how their filled and everything but im puzzled with this one. i think it has the the confuguration of argon, could it be Ar^-2?

lastly, i need to decide the right formulae for the following molecules (in relation to covalent bonding;

O and O
N and N
Cl and Cl
they will either have single,doulble or triple bonds.
i think so far O and O will have double bonds and N and N triple is this right so far?

Next i need to find out what non-metal anion is been represented here (it has a charge of ^-2) 1s^2 2s^2 2p^6 3s^2 3p^6.

Charge of -2 means it has 2 electrons more than it has protons. 18 electrons, so 16 protons.

^ thanks guys for your help, i worked out the anion one, it was sulfur, since sulfur and oxygen were the only ones i could think of that had -2 charge, and sulfur has 16 protons .