C2.1.2

• Groups 1 - 3 form positive ions and groups 5 - 7 form negative ions
• Transition metals can form multiple ions whos charges are depicted by roman numerals
• What is the symbol for a zinc ion?

  Zn2+
• What is the symbol for a Silver ion?

  Ag+
• What is the symbol for an ammonium ion?

  NH4+
• What is the symbol for a Nitrate ion?

  NO3-
• What is the symbol for a Sulfate ion?

  SO42-
• What is the symbol for a Dichromate ion ?

  Cr2O72-
• What is the symbol for a Hydrogencarbonate ion?

  HCO3-
• What is the symbol for a Hydroxide ion?

  OH-
• What is the symbol for a Carbonate ion?

  CO32-
• What is the symbol for a Phosphate ion?

  PO43-
• What is the symbol for a Manganate ion?

  MnO4-
• Polyatomic ions are ions composed of more than one element
• What is the formula for Ammonia?

  NH3
• singular ions generally end in ide
• Polyatomic ions generally end in ate
• A Binary Compound is a compound containing only two elements
• A diatomic molecule is a molecule containing two atoms of the same element
• List the diatomic molecules:

  • H2
  • N2
  • O2
  • F2
  • Cl2
  • Br2
  • I2
• Define a Formula unit

  the empirical formula of any ionic or covalent solid compound used in calculations or equations
• Define an ionic equation

  An equation in which only the reacting particles and the products they form are included
• Define a spectator ion

  An ion that is present but does not take part in a chemical reaction
• To find an ionic equation:

  1. write out a full balanced equation
  2. re-write to show all ions in the reaction separately
  3. cross out any ions that appear on both sides
• Always ensure that all charges are balanced when writing chemical equations