Chemistry 0620 · IGCSE · Atomic structure and the Periodic Table

Atomic structure and the Periodic Table — practice question

Atoms X and Y have the same mass number, but their atomic numbers are different. Which of the following statements about X and Y is correct?

  • AThey have the same number of protons.
  • BThey have the same number of electrons.
  • CThey are in the same group of the Periodic Table.
  • DThey have different numbers of neutrons.

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