Ionisation energies and electron shellsEdexcel International A Level Chemistry: Mind map

Exam questions on Ionisation energies and electron shells

1. A data-analysis class is studying the ionisation energies of calcium, an element in Group 2 of the Periodic Table.
   Define the term first ionisation energy.2 marks
2. An unidentified element X has the following successive ionisation energies, in kJ mol⁻¹: first 578, second 1817, third 2745, fourth 11 577 and fifth 14 842.
   Explain why the second ionisation energy of X is greater than its first ionisation energy.2 marks
3. The first ionisation energies of Group 1 elements are, in kJ mol⁻¹: lithium 520, sodium 496 and potassium 419. The second ionisation energy of potassium is 3052 kJ mol⁻¹.
   Explain why the first ionisation energy decreases from lithium to potassium.3 marks