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a
number of electrons
b
number of neutrons
c
ionic mass
d
All of these
answer is D.
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Detailed Solution
H+,D+ and T+ have same number of electrons (zero electrons). They have 0,1 and 2 neutrons respectively. Thus, they differ in the number of neutrons. They have ionic mass of 1 amu, 2 amu and 3 amu respectively. Thus, they differ in the ionic mass.