Chemistry · Oct / Nov 2017 · Paper 12 · Question 28

The elements helium, argon and neon are noble gases. Which statement is correct?

1. AAll these elements have eight electrons in their outer shell.
2. BArgon is used to react with impurities in the manufacture of steel.
3. CHelium is used in balloons as it is more dense than air.
4. DNeon is used in light bulbs to give an inert atmosphere.

As printed in the paper