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A-LevelChemistryAtomic structure9701/12 · Oct/Nov 2022 · Q11 Mark

Why is the first ionisation energy of phosphorus greater than the first ionisation energy of silicon?

Aphosphorus atom has one more proton in its nucleus.
BThe atomic radius of a phosphorus atom is greater.
CThe outer electron in a phosphorus atom is more shielded.
DThe outer electron in a phosphorus atom is paired.

✓ Correct answer

A: phosphorus atom has one more proton in its nucleus.

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About this question

Topic
Atomic structure, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source
A-Level Chemistry, Oct/Nov 2022 Paper 1 Variant 2, question 1.

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