The modern period table

• The Periodic Table


  • Helps you to see patterns in properties
  • Organises the 100+ elements which all materials are made of
• The elements are laid out in order of increasing atomic number
• Periodic

  The properties are said to occur periodically, hence the name periodic table
• The Periodic Table


  • Helps to determine which elements are metals and which are non-metals
  • Metals are found to the left, non-metals to the right
• Groups

  • 1
  • 2
  • 3-12
  • 13-18
• Group number


  Tells you how many electrons are in the outer shell
• Elements in the same group are likely to react in a similar way
• The periodic table can be used to predict trends in properties, e.g. reactivity increases down Group 1, electronegativity decreases down Group 7
• Periods


  Each new period represents another level of electrons
• Chemistry band


  • Os
  • Fr
• The periodic table allows us to see trends in both activity and properties, which means we can make predictions on how reactions will occur
• To determine how many electrons beryllium has in its outer shell

  1. Look up beryllium on the periodic table

  2. Find the group number

  3. The group number tells you the number of electrons in the outer shell