Important Groups in Periodic Table

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Group 1 - Alkaline Metals

Properties include:

  • Low density - first three float on water
  • React with non metals to form an ionic compound
  • React with group 7 to make salts that are white or colourless
  • React with water releasing hydrogen - below potassium reaction very violent and dangerous
  • Form hydroxides that dissolve in water to give alkaline solutions

The further down the group you go:

  • The more reactive the element - outer electron less strongly attracted to the nucleus - number of occupied energy levels increases
  • The lower the melting/boiling point

The Transition Metals

Found between groups 2 + 3

Compared to group 1 metals:

  • Have much higher melting/boiling points - except for mercury
  • Are harder and…

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