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What is an Isotope?

  • A.Atoms of an element having different mass number
  • B.Atoms of an element having different atomic number
  • C.Atoms of an element having same atomic number
  • D.Atoms of an element having same mass number

Answer: A

Isotopes are atoms of the same element with different mass numbers - the same number of protons but different numbers of neutrons.

Hydrogen has three: protium, deuterium and tritium. Because the chemistry depends on the electrons, isotopes of an element behave chemically alike.

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