What is the chemical formula and name when the following are added:

Question

1. Na+1 Na-3

2. Na+1 Br-1

3. Na+1 O-2

Answer 1

I think the formulas are

Na3Na

NaBr

Na2O

How do I get the names?

Answer 2

Again, the first one is nonsense.

on the second Sodium bromide
on the last sodium oxide