What is the charge over a doubly ionized atom ?

What is the charge over a doubly ionized atom ?

a. 3.2 × 10^-19C
b. 1.6 × 10^-19C
c. -1.6 × 10^-19C
d. -3.2 × 10^-19C

Correct Answer : a. 3.2 × 10^-19C

Explanation :

Basically, the charge on an electron is -1.6 × 10^-19C. Therefore, doubly ionized atom value will be definitely double of electron charge.