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Chemistry · May / June 2025 · Paper 12 · Question 4

5070Atomic structure and the Periodic Table

Atoms of element Q form positive ions. An ion of Q has 10 electrons and 14 neutrons. Which statement is correct?

  1. AAn atom of Q has only two occupied electron shells.
  2. BQ is a non-metal.
  3. CThe atomic number of Q is 10.
  4. DThe mass number of Q is greater than 24.

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Correct answer: D. The mass number of Q is greater than 24.

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