You are presented with the question "if an atom loses an what it forms an ion" and the following answer choices: 
- energy
 - Energy.
 - heat energy
 - electron
 - nucleus
 - vaporization
 - neutron
 - bond

Now knowing that if a neutral atom loses an electron then an atom with a negative charge will be formed and when an atom or molecule is no longer neutral it is called an ion , choose the best answer.


 

    electron     