Answer the following question given this paragraph: 

By losing an electron, the sodium atom becomes a sodium ion. It now has more protons than electrons and a charge of +1. Positive ions such as sodium are given the same name as the element. The chemical symbol has a plus sign to distinguish the ion from an atom of the element. The symbol for a sodium ion is Na + .


Q: Ions can be formed when atoms lose what other particles?


A:
electrons