How do you calculate the oxidation number of S in SnS^2?Watch
Why is it -2 is this because it's in group 6? We weren't taught the rules for group 6. We were only told about group 7. The rule for group 7 is 1- when a metal? Is it true when it's a metal in group 7 it's 1 - or does it mean non-metal?
Group 7 is 1-