Question

An electron in a calcium atom gains enough energy to move from the first shell to the second shell, the calcium atom becomes:

A. A negative ion
B. A positive ion
C. An atom in an excited state
D. An atom in the ground state

Answer 1

When a neutral atom gains an electron it becomes negatively charged and we call it an anion.

Step-by-step explanation:

When a neutral atom gains an electron it becomes negatively charged and we call it an anion. For example chlorine will gain one electron and become CI¯ or oxygen will gain two electrons and become O²-.