1.If an atom gains one electron what charge will it have?. +2 +1 -1 -3 2. If an atom loses two electrons what charge will it have? -2 +2 -1 +1

1. If an atom gains one electron, it will have a charge of $-1$. Electrons have a negative charge, so when an atom gains an electron, it gains a negative charge.<br /><br />2. If an atom loses two electrons, it will have a charge of $+2$. Electrons have a negative charge, so when an atom loses electrons, it loses negative charge and becomes positively charged. Since it loses two electrons, the charge will be $+2$.