1: An ion of magnesium has 12 protons and a charge of + 2. How many electrons are in this ion?

A. 2

B. 10

C. 12

D. 14

A neutral atom has equal number of protons and electrons. In this case, we are given with an ion with a positive charge of + 2. This means there is a surplus of protons and a shortage of electrons. In this case, a charge of + 2, means a electron count of 10 only. Answer is B