Polyatomic Ions and Ionic Bonding What we know

Polyatomic Ions and Ionic Bonding

What we know…………… Ionic Bonds form between a metal and a non-metal In an ionic bond, electrons are transferred from the metal (cation) to the non-metal (anion)

Polyatomic Ions An ion made up of two or more elements Elements stay together and act as one unit in chemical reactions Together, the elements still carry charge Ex) hydroxide = OH-

Common Polyatomic Ions

Writing Formulas with Polyatomics Follow the same procedure as we learned last class, with one small exception. If more than one Polyatomic Ion is needed to balance the charges, you must use parentheses around the ion before writing subscript Ex: Magnesium Hydroxide (Mg+2, OH-1) Incorrect Formula: Mg. OH 2 Correct Formula: Mg(OH)2

Formula Examples Sodium Phosphate: Na+ + PO 43 - = Na 3 PO 4 Magnesium Phosphate: Mg 2+ + PO 43 - = Mg 3(PO 4)2

Naming with Polyatomics Good News! You just use the name of the polyatomic ion! Ex: Ca. CO 3 Ca = calcium, CO 3 = carbonate Name = calcium carbonate

Writing Polyatomics in Formulas Write the formulas for the following compounds: Strontium Nitrite Calcium Hydroxide Iron (III) Carbonate Copper (II) Sulfate Ammonium Sulfide Ammonium Nitrate

Naming with Polyatomic Ions Write the names of the following polyatomic ions: Mg(OH)2 Na 2 SO 4 Al 2(SO 4)3 Pb 3(PO 4)4 NH 4 NO 3

Mixed Practice - Naming Write the names for the following compounds Ag. Cl 3 Fr 3 N Fe 3(PO 4)2 Cu. CO 3 Na. Cl Sn(CO 3)2 NH 4 OH

Mixed Practice - Formulas Write the formulas for the following compounds Magnesium Peroxide Tin (IV) Chromate Ammonium Phosphate Copper (II) Permanganate Mercury (I) Chloride Ammonium Oxide Strontium Phosphide Aluminum Iodide