Ionic Formulae

• Ion


  An atom or group of atoms that has a positive or negative charge.
• Polyatomic ion


  An ion made of two or more atoms
• Ionic compound


  A compound that consists of positive and negative ions

  
• Formation of ionic compounds

  Metal gives electron(s) to non-metals

  
• Ionic formula


  The simplest whole number ratio of the ions which form a neutral ionic compound

  
• Group 1 charge


  +1

  
• Group 2 charge


  +2

  
• Group 3 charge


  +3

  
• Group 5 charge


  -3

  
• Group 6 charge


  -2

  
• Group 7 charge


  -1

  
• Charges in an Ionic Compound


  Cancel one another out

  
• Hydroxide ion


  OH-

  
• Carbonate ion


  CO3 2-

  
• Nitrate ion


  NO3-

  
• Ammonium ion


  NH4+

  
• (s)


  Solid
• (l)


  Liquid
• (g)


  Gas
• (aq)


  Aqueous