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Ionisation energiesEdexcel A-Level Chemistry: Mind map

What this mind map covers

  • Definitions
  • Factors
  • Successive values
  • Across a period
  • Down a group

Exam questions on Ionisation energies

  1. Element X is in Period 3 of the periodic table. Its first five successive ionisation energies, in kJ mol⁻¹, are: 1st 738, 2nd 1451, 3rd 7733, 4th 10543, 5th 13630.
    Explain why the third ionisation energy of X is much greater than its second ionisation energy.2 marks
  2. The first ionisation energies of the Group 1 metals lithium, sodium, potassium and rubidium are 520, 496, 419 and 403 kJ mol⁻¹ respectively.
    Explain why the first ionisation energy of rubidium is lower than that of sodium.2 marks
  3. The first ionisation energies of the Period 3 elements, in kJ mol⁻¹, are: Na 496, Mg 738, Al 578, Si 786, P 1012, S 1000, Cl 1251 and Ar 1521.
    Explain the general increase in first ionisation energy from sodium to argon.3 marks
See the full worksheet

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).