Naming Chemical Compounds
Positive monatomic ion (metal cation) = name of the metal + “ion.”
Transition metals (form more than one type of positive ion) = charge of ion indicated with
Roman Numerals after the metal name.
o Ion with higher charge – name ends in “-ic.”
o Ion with lower charge – name ends in “-ous.”
Negative monatomic ion = add “-ide” to stem of nonmetal element the ion is derived from.
Polyatomic anions have 1 or more oxygen atoms (oxoanions)
o If there are 2 members in the series:
Larger number of O atoms = name ends in “-ate.”
Smaller number of O atoms = name ends in “-ite.”
o If there are more than two in the series:
Most number of O atoms = “per-“ + stem+ “-ate.”
2 most = stem + “-ate.”
2 least = stem + “-ite.”
Least = “hypo-“ + stem + “-ite.”
When naming ionic compounds, positive ion name is given first, then the name of the negative ion.
Name is two words – one for each element in the compound.
1 element = use full element name.
2 element = stem + “-ide.”
Use prefixes to indicate number of atoms present:
o 1 element - only if there is more than 1.
o 2 element – regardless of how many (use “mono-“ for one, “di-“ for two, etc).
Formed by hydrogen + a second element “hydrogen“ + stem + “-ide” “hydro-“ + stem + “-ic acid.”
Formed from hydrogen, oxygen, + a third element.
Acid name is formed