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The atoms having same atomic mass but different atomic number are called :

  • A.Isotopes
  • B.Isobars
  • C.Isomers
  • D.Isotones

Answer: B

Such atoms are isobars.

Isobars have the same mass number but different atomic numbers, so they are different elements, for example \(^{40}_{18}\text{Ar}\) and \(^{40}_{20}\text{Ca}\).

Isotopes have the same atomic number but different mass numbers (\(^{12}\text{C}\) and \(^{14}\text{C}\)). Isotones have the same number of neutrons. Isomers are compounds with the same molecular formula but different structures.

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