The isobar of calcium (20 Cal is
(A) 17X39
(B) 18X40
(C) 10X1
(D) 2X
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From the given pair of examples, the pair of isobars which could be formed are: 18 Ar 40, 20 Ca 40, 17 Cl 35, 17 Cl 37. An isobar is each of two or more isotopes of different elements, with the same atomic weight. Isobars are atoms of different chemical elements that have the same number of nucleons.
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