Chemistry 0620 · IGCSE · Atomic structure and the Periodic Table

Atomic structure and the Periodic Table — practice question

Which atom contains the same number of protons, neutrons and electrons?

  • A$^{40}_{18}\text{Ar}$
  • B$^{1}_{1}\text{H}$
  • C$^{23}_{11}\text{Na}$
  • D$^{14}_{7}\text{N}$

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