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

1MasterySAQ-SPeriodic trends: Atomic radius, ionization energy, electronegativity5 marksPaper 2~8 min
This question is about the elements of Period 3.
(a)
State the trend in atomic radius across Period 3 from sodium to argon. [1 mark]
(b)
Explain why the first ionization energy of aluminium (578 kJ mol−1578\,\text{kJ mol}^{-1}) is lower than that of magnesium (738 kJ mol−1738\,\text{kJ mol}^{-1}), despite aluminium having a greater nuclear charge. [4 marks]
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