I ONIC BONDS - POLYATOMICS KF CHEMISTRY

P OLYATOMIC POLYATOMIC ION-ion made up of more than one atom. Ex. NO 3 -1 (made up of one nitrogen and three oxygens)

POLYATOMICS NO 3 -1 The charge given to a polyatomic ion applies to the entire group of atoms. Ex. NO 3 -1 has a overall charge of -1.

COMMON POLYATOMICS NO 2 -1 nitrite NO 3 -1 nitrate CO 3 -2 carbonate SO 3 -2 sulfite SO 4 -2 sulfate PO 4 -3 phosphate OH -1 hydroxide NH 4 +1 ammonium

POLYATOMICS-WRITING FORMULAS Na +1 NO 3 -1 Formula???? NaNO 3 Mg +2 NO 3 -1 Formula???? Mg(NO 3 ) 2 If more than one polyatomic ion is needed, place parentheses around and write subscript outside. Never change subscripts of the atoms within the ion!!!!!

P RACTICE !! Mg +2 CO 3 -2 MgCO 3 Na +1 CO 3 -2 Na 2 CO 3 Mg +2 NO 3 -1 Mg(NO 3 ) 2

POLYATOMICS-NAMING If a compound contains a polyatomic ion, simply name the ion. Ex. NaNO 3 = sodium nitrate Ex. Mg(OH) 2 = magnesium hydroxide

P RACTICE !! CaCO 3 Calcium Carbonate MgSO 4 Magnesium sulfate AlPO 4 Aluminum phosphate