Ions

Ions are Atoms that have  lost or gained Electrons  and form when  an Atom loses or gains an Electron to become Stable 
 * Atoms that have gained electrons are called "negative" Ions  which are  called Anions , these Ions are marked with a  -  sign
 * Atoms that have Lost electrons are called "Positive" Ions  which are  called Cations , these Ions are marked with a  +  sign

An Atom that has gained an Electron to become stable, this type of Ion is Positive An Atom that has lost an Electron to become stable, this type of Ion is  Negative 
 * -|Cation=
 * -|Anion=

Extra

 * Group 1 - 2 make Anions
 * Group 15 - 17 make Anions
 * Group 13 - 14 can take or lose Electrons