Metals and non metals make up all of the periodic table and they are arranged in a certain order.
Covalent bonding is the bonding found in non metals, involving the sharing of a pair of electrons or more between the atoms.
States of Matter are the different forms that elements, compounds and mixtures will exist in as either solids, liquids or gases depending on how close their particles are.
Group 18 the Noble Gases are the name given to a collection of gases that exist in Group 18 at the very end of the periodic table. They are all non metals and exist as monoatomic gases which are relatively inert and unreactive due to their full outer shell of electrons.