C. If an atom has 8 protons and 10 electrons, what is the charge?

What type of ion is it

2-; anion

Explanation:

1. Charge

Charge = + 8 - 10 = - 2

However, when we talk about the charge on an ion, we put the number first, so we say charge is 2-.

2. Type of ion

The ion has a negative charge, so it is an anion.

The nucleus has eight protons (oxygen), so it is an oxyanion.

The symbol for an oxyanion with two negative charges is O²⁻, and its name is the oxide ion.