Structure of Atom Part 1
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Question : 42 of 100
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Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z), the sum of (x), (y) an (z) is :
[8 Jan 2020 Shift 2]
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