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