# How many CHARGED nuclear, and electronic particles are present in "potassium nitride"?

In potassium nitride I count $\text{64 protons}$ and $\text{64 electrons}$.
This is a neutral salt, and as such there must be equality between electrons, and nuclear protons. Nitrogen has an atomic number, $Z = 7$. Potassium has an atomic number, $Z = 19$.
So there are $7 + 3 \times 19 = 64 \cdot \text{protons}$; and there must be an equal number of electrons in the neutral salt: $3 \times 18 + 10 = 64 \cdot \text{electrons}$. All I am doing is using the atomic numbers of potassium and nitrogen to tell me how many protons there are, and how many electrons there must be in the ions ${K}^{+}$ and ${N}^{3 -}$.