topic 1

• Group 1 metals

  • called alkali metals
• properties of alkali metals

  • soft
  • relatively low melting points
  • have low densities
• alkali metals

  • melting point decreases as you move down the group
  • highly reactive
  • salts containing alkali metals are soluble
  • 1 electron in outer shell
• elements get less reactive as you move down the group

  • larger atom
  • larger radius
  • less forces between electrons and nucleus
• transition metals

  • conduct electricity
  • shiny when freshly cut
  • higher melting points and densities
  • stronger than metals
• alkali metals

  • react vigorously in water and with halogens
• Noble gase

  • unreactive
  • 8 electrons in outer shell- stable
  • boiling point increases with increasing relative atomic mass
• Halogens

  • 7 electrons in outer shell
  • some are diatomic
  • further down the group, higher boiling and melting points are
  • reactivity decreases down the group