Chemistry 0620 · IGCSE · Atomic structure and the Periodic Table

Atomic structure and the Periodic Table — practice question

This atom has 3 electron shells. Its outer shell contains 3 electrons. How many protons and how many neutrons does this atom contain?

  • A13 protons, 14 neutrons
  • B13 protons, 27 neutrons
  • C14 protons, 13 neutrons
  • D21 protons, 24 neutrons

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