1.

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 : (1) 4 (2) 3 (3) 2 (4) 1

Answer»

Answer is (2)

Hydrogen has three isotopes

Isotopes Number of neutrons
Deutrium (21H) 1 
Protium (11H) 0
Tritium (31H)2

Hence the sum of neutrons are 3

Answer is (2)



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