Composition of the nuclei of two atomic species Is Given as A. Protons 18,20 B. Neutron 22, 20
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Mass number is the sum of the number of neutrons and the number of protons. So, mass number of A and B is 40. As the mass number of A and B is same, the two are isobars. Therefore, A represents ( Ar 18 40 Ar ) Argon while B represents ( Ca 20 40 Ca ) Calcium.
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