Valency
The valency of an element is equal to the number of electrons that each atom needs to gain, lose or share to fill its outermost shell.
What are ions
Ions are charged atoms
How are ions created
When an atom loses or gains electrons and becomes charged
What is ionic bonding
Ionic compounds form when positive and negative ions chemically combine to create a new compound.
What are cations
They are positively charged ions
What are anions
They are negatively charged ions