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The Periodic Table: Classification of Elements · Paper 2 — Free Chemistry HL Practice Questions

1MasterySAQ-SPeriodic trends: Atomic radius, ionization energy, electronegativity5 marksPaper 2~8 min
The graph below shows the first ionization energies of the elements across Period 3 (Na to Ar).
(a)
State the general trend in first ionization energy across Period 3 from Na to Ar. [1 mark]
(b)
Explain why the first ionization energy of Al is lower than that of Mg. [2 marks]
(c)
The first ionization energy of S (1000 kJ mol−11000\,\text{kJ mol}^{-1}) is lower than that of P (1012 kJ mol−11012\,\text{kJ mol}^{-1}), despite S having a higher nuclear charge. Explain this anomaly using electron configurations. [2 marks]
diagram

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