Metals and non metals

• • Metals are elements that react to form positive ions
  • Non metals are elements that react to from negative ions
• • Metals to the left of the periodic table don’t have many electrons to remove
  • Metals towards the bottom of the periodic table have many shells so outer electrons have weaker attraction to nucleus
  • Not much energy needed to remove electrons
• • Non metals to the right of the periodic table have alot of electrons to remove to get a full outer shell
  • Non metals to the top of the periodic table have less shells so outer electrons are closer to the nucleus and so have strong attraction
  • so, non metals share or gain elections to get full outer shell
• • metals have metallic bonding so they have similar physical properties:
  • strong and malleable
  • good conductors of heat and electricity
  • high boiling and melting points
  • non metals don’t have metallic bonding and so are:
  • dull looking
  • brittle
  • are not always solid at room temp
  • don’t conduct electricity
  • lower density
• • transition metals have ions with different charges, form coloured compounds and are useful as catalysts
  • transition metals have properties of a typical metal