What is the net charge of a monatomic ion that has 15 protons, 16 neutrons, and 18 electrons?

NY Regents Chemistry Exam Jan 2023

What is the net charge of a monatomic ion that has 15 protons, 16 neutrons, and 18 electrons? (1) 2+

(2) 2-

(3) 3+

(4) 3-

Solution: Protons have a charge of +1, neutrons have no charge and electrons have a charge of -1. 15 protons and 18 electrons are 15 positive charges and 18 minus charges. +15-18 = -3

Choice 4