electronic configuration + reactivity

• why do elements in the same group have similar chemical properties?

  because they have the same number of outer electrons + so they will react similarly
• what can the group number be used to do?

  to predict how elements will react as the number of outer shell electrons in an element influences how the element reacts
• what compound can be formed by a group 1 + group 7 element?

  ionic compound
• do group 1 metals become more reactive as you move down or up the group?

  down
• do group 7 metals become more reactive as you move down or up the group?


  up
• describe noble gases

  • non-metals
  • monatomic (exist as single atoms)
  • colourless + non-flammable
• why are noble gases unreactive?

  because they have a full outer shell - they do not need to lose, gain or share electrons
• which noble gas is the odd one out + why?

  Helium because it has two electrons in its outer shell