Ions are formed when an atom gains or loses electrons.
* Losing electrons: When an atom loses electrons, it becomes positively charged because it now has more protons (positive charge) than electrons (negative charge). This type of ion is called a cation.
* Gaining electrons: When an atom gains electrons, it becomes negatively charged because it now has more electrons than protons. This type of ion is called an anion.
So, to answer your question directly: Yes, an ion is formed when an atom loses an electron, but it's only one type of ion (a cation). The other type of ion is formed when an atom gains an electron (an anion).
