To form government, a political party needs to win the majority of the 151 seats in the House of Representatives.

Some of those seats are considered safe, where the representative voted in at the last election is so popular that they are a shoo-in for re-election, or where a community has a strong political leaning in one direction. But there are a number of electorates across the country that are deemed at risk of changing political hands – and they could win or lose the government an election.