periodic table exam qs

• The electronic configurations of magnesium and calcium are 2.8.2 and 2.8.8.2. Why is calcium more reactive than magnesium?

  Calcium's outermost electrons are further away from the nucleus than magnesium therefore there is less attraction between the nucleus and the electrons so they are easier to remove
• Why is a group 0 element suitable to be used to fill filament light bulbs?

  It is unreactive as it has a full outer shell preventing from the filament reacting
• Explain using its position in the periodic table, whether indium is a metal or a non-metal (group 3):

  Metal because boron is the only non-metal in group 3
• What is the mass of an electron?

  1/1837
• What is the formula for aluminium nitride?

  AlN
• What is meant be relative atomic mass?

  The average mass of an atom of an element compared to 1/12 the mass of a carbon-12 atom.