A-LevelChemistryAtomic structure9701/12 · Oct/Nov 2024 · Q21 Mark
Which factor causes helium to have a higher first ionisation energy than hydrogen?
AIn the 1s orbital in helium, electrons are paired.
BThe lowest energy level in helium is filled.
CThe nuclear charge in helium is higher than in hydrogen.
DThere is less shielding of the outer shell in helium.
✓ Correct answer
C: The nuclear charge in helium is higher than in hydrogen.
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