Question

neutral atom
ion with a charge of -1
ion with a charge of +2
atom with a mass number of 3

Explanation:

Step1: Determine neutral atom

A neutral atom has equal number of protons (positive charges in nucleus) and electrons (negative charges). In B, number of protons (counted from nucleus) and electrons (blue dots) are equal.

Step2: Determine ion with charge - 1

An ion with charge - 1 has one more electron than proton. In A, number of electrons is one more than protons.

Step3: Determine ion with charge + 2

An ion with charge + 2 has two fewer electrons than protons. In D, number of electrons is two less than protons.

Step4: Determine atom with mass number 3

Mass number is sum of protons and neutrons. In C, sum of protons and neutrons (in nucleus) is 3.

Answer:

Neutral atom: B.
Ion with a charge of - 1: A.
Ion with a charge of + 2: D.
Atom with a mass number of 3: C.