CAPE Physics Unit 2 · 2018 · Paper 1 · Question Q35

The outer electron of a lithium atom is in the -8.68\text{ eV} level. How much energy is required to ionize the atom?

1. (A)2.0 \times 10^{-19}\text{ J}
2. (B)5.8 \times 10^{-9}\text{ J}
3. (C)1.4 \times 10^{-18}\text{ J}
4. (D)8.7 \times 10^{-19}\text{ J}

This question uses a figure or table from the paper — you'll see it when you practise.