Neon is used in brightly coloured advertising signs. The glass tube of a sign is filled with neon at low pressure and a high voltage is applied.
Neon has two main isotopes: 90% of neon atoms are neon-20 and 10% are neon-22.
Calculate the relative atomic mass of neon.
Explain why neon-20 and neon-22 have the same chemical properties.
A sign contains 0.101 g of neon. Calculate the number of neon atoms in the sign. Use your answer to (a). The Avogadro constant is 6.02 × 1023 per mole.
Suggest why the tube is filled with neon rather than air, which contains reactive oxygen.
38 exam-style questions on Edexcel GCSE Chemistry 7.3 Group 0, covering 7.3.1 The noble gases. Each one has a worked solution and a mark scheme showing where the marks go.