Chemistry · May / June 2021 · Paper 12 · Question 7
5070Atomic structure and the Periodic Table
Use the Periodic Table to answer this question. Which two particles have the same number of electrons?
- AAr and Ca
- BNa+ and K+
- CFe2+ and Fe3+
- DCa2+ and Sc3+
As printed in the paper
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Correct answer: D. Ca2+ and Sc3+
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