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Per NCERT, isotopes of hydrogen include protium (¹H), deuterium (²H), and tritium (³H). What distinguishes the three?
ANumber of electrons (1, 2, 3)
BNumber of neutrons (0, 1, 2 respectively) — protons stay at 1
CNumber of protons (1, 2, 3)
DAtomic mass alone with no compositional change
Answer & Solution
Correct answer: B. Number of neutrons (0, 1, 2 respectively) — protons stay at 1
Per NCERT §2.2.4, all H isotopes have 1 proton (Z = 1). They differ only in neutron count: protium 0, deuterium 1, tritium 2.
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