Question

if an ion has three more electrons than protons, it has a
○ mass of +3.
○ mass of -3.
○ charge of +3.
○ charge of -3.

Explanation:

Step1: Recall charge - carrier properties

Protons have a charge of + 1 and electrons have a charge of - 1.

Step2: Calculate ion charge

If there are 3 more electrons than protons, let the number of protons be $p$ and the number of electrons be $e=p + 3$. The charge of the ion $Q=p\times(+1)+e\times(-1)=p-(p + 3)=-3$.

Answer:

Charge of -3.