A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion?
Protons have a charge of (1+) meaning they are positively charged.
Electrons are negatively charged, they have a charge of (1-).
While, neutrons don't have any charge at all.
So the answer is:
7 - 10 = -3
The Nitride Ion has a charge of -3