In the following table, the mass number and the atomic number of certain elements are given. Element A B. C D E Mass number 1 7 14 40 40 Atomic number 1 3 7 18 20 a) How many neutrons are present in B and D? b) What would be the valency of element C
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a)Elements D and E are isobars as they have a same mass number but a different atomic number.
b)The atomic number of element B is 3. So its electronic configuration is 2,1. Hence its valency is 1 as it has only 1 valence electron.
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