Ion -- charged particle
Polyatomic ion -- many-atomed charged particle: Examples When using polyatomics and you need more than one of the polyatomic ion, you must place it in ( ) and add the subscript to the outside of the ( )

           Ca2+  and  CO32    =     CaCO3                          Ba2+  and  OH   =   Ba(OH)2

Test Review, Friday, October 10

  • Write ions from formulas
  • Write formulas from ions