A-Level H2 Chemistry Practice Questions - Singapore-Cambridge GCE A-Level Higher 2 (H2) Chemistry (Syllabus 9729) Exam

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Why is the first ionisation energy of aluminium lower than that of magnesium, despite aluminium having a higher nuclear charge?

The electron removed from aluminium is in a 3p orbital which is higher in energy and more shielded than the 3s electron removed from magnesium Aluminium has a larger atomic radius than magnesium Magnesium has a half-filled 3p subshell that confers extra stability Aluminium has fewer protons than magnesium

Correct Answer:

The electron removed from aluminium is in a 3p orbital which is higher in energy and more shielded than the 3s electron removed from magnesium

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