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Isotopes of an element contain

  • A.The same number of protons but different number of neutrons
  • B.The same number of neutrons but different number of protons
  • C.Equal number of protons and electrons
  • D.Equal number of nucleons

Answer: A

Isotopes have the same number of protons but different numbers of neutrons.

The proton count fixes the element and its chemistry; the differing neutron count changes only the mass. Carbon-12, carbon-13 and carbon-14 are examples, all with six protons.

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