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The total number of nucleons in the atom...

The total number of nucleons in the atoms of clacium and argon is 40 and the atomic numbers of calcium neutrons present in the nucleus of argon atom.

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The elements which have same no of nucleons but different atomic number are called isobars .Therefore calcium (Ca) and argon (Ar) represetn a pair of isobars. ltrbgt No of neutrons in the nucleus of Ar =40-18=22
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