Question

One of the particles in atoms is called an electron. It has

particle in atoms is a proton. It has charge of +1.
The overall charge of an atom is the sum of the charges of the electrons and the
protons. Here is a list of common elements.

Answer 1

To find the total charge, it seems we should add the charge of protons and electrons here.

Aluminum: (-10) + 13 = 3

Aluminum has an overall charge of +3.

Phosphide: (-18) + 15 = -3

Phosphide has an overall charge of -3.

Iodide: (-54) + 53 = -1

Iodide has an overall charge of -1.

Tin: (-50) + 50 = 0

Tin has an overall charge of 0.