ION
It a charged particle formed when electrons are removed or added to an atom.
CATION (usually metal)
Is a POSITIVELY charged ion
ANION ( usually non metal)
NEGATIVELY charged ion
POLYATOMIC IONS
consist of atoms joined as in a molecule, but they have a net positive or negative charge
IONIC COMPOUNDS
A compound made up of cations( metals) and anions( non metals) where there has been a transfer of electrons
MOLECULAR COMPOUNDS
are generally composed nonmetals only
CHEMICAL COMPOUNDS
( molecular and ionic) are always electrically neutral therefore the total positive charge equals the total negative charge