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Chemistry · Oct / Nov 2025 · Paper 12 · Question 3

5070Atomic structure and the Periodic Table

Atom X has an atomic number of 19 and a nucleon number of 42. Atom Y has an atomic number of 20 and a nucleon number of 40. Which statement is correct?

  1. AAtom X contains two more electrons than atom Y.
  2. BAtom X contains three more neutrons than atom Y.
  3. CAtom Y contains one more neutron than atom X.
  4. DX and Y are atoms of the same element.

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Correct answer: B. Atom X contains three more neutrons than atom Y.

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