Fact 1: If a neutral atom loses an electron then an atom with a negative charge will be formed.

Fact 2: When an atom or molecule is no longer neutral it is called an ion .

Given the two facts above, answer the question "if an atom loses an what it forms an ion" with the following options: 
- energy
 - Energy.
 - heat energy
 - electron
 - nucleus
 - vaporization
 - neutron
 - bond


 

    electron     