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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 ($x$), ($y$) and ($z$) is:
(a) 3 (b) 2 (c) 4 (d) 1
Protium: 0 neutrons, Deuterium: 1 neutron, Tritium: 2 neutrons. Sum = 0 + 1 + 2 = 3.
BETA
