Chemistry · Oct / Nov 2019 · Paper 12 · Question 23

Helium and xenon are both noble gases. What is true of both elements?

1. Athey are chemically inert ✓ ; the atoms have eight electrons in their outer shell ✓
2. Bthey are chemically inert ✓ ; the atoms have eight electrons in their outer shell ✗
3. Cthey are chemically inert ✗ ; the atoms have eight electrons in their outer shell ✓
4. Dthey are chemically inert ✗ ; the atoms have eight electrons in their outer shell ✗

As printed in the paper