A-LevelChemistryAtomic structure9701/12 · Oct/Nov 2013 · Q311 Mark
X is a particle with 18 electrons and 20 neutrons. What could be the symbol of X? 1. ³⁸₁₈Ar 2. ⁴⁰₂₀Ca²⁺ 3. ³⁹₁₉K⁺
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct answer
A: 1, 2 and 3 are correct
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