O-LevelChemistryAtomic Structure5070/11 · May/June 2023 · Q31 Mark

The numbers of electrons, protons and neutrons in four different particles are shown. particle electrons protons neutrons 1 19 19 20 2 18 19 20 3 20 20 20 4 19 19 22 Which particles are isotopes of the same element?

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A1 and 2 only

B1 and 3 only

C1 and 4

D1, 2 and 3

✓ Correct answer

C: 1 and 4

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Topic: Atomic Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2023 Paper 1 Variant 1, question 3.

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