A high school chemistry teacher asks four student groups to determine the number of protons, neutrons, and electrons (respectively) present in an ion of Titanium (Ti 2+). Which student group provides the best answer?

Electrons - 20

protons - 22

neutrons - 26

Explanation:

Titanium has an atomic number of 22 indicating that the neutral atom has 22 protons.

Ti 2+ has lost two electrons and contains only 20 electrons, 22 protons.

The mass number of titanium is 48. Hence;

Mass number = atomic number + number of neutrons

Since the atomic number is 22 and the mass number is 48

number of neutrons = 48 - 22 = 26 neutrons