The isotope of hydrogen which is/are radioactive in nature:

protium and deuterium

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tritium and deuterium

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only tritium

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only deuterium

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Solution

The correct option is D only tritium
3H (atomic mass 3.0160492 u) is known as tritium and contains one proton and two neutrons in its nucleus. It is radioactive.

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Question 5

Radioactive elements emit $α, β a n d γ$ rays and are chacterised by their half-lives. The radioactive isotope of hydrogen is

(a) protium (b) deuterium (c) tritium (d) hydronium

_{1} H^{1}

_{1} {H^{2}}^{2}

_{1} H^{3}

Which isotope of hydrogen : Protium, deuterium or tritium has maximum ionisation energy and why?

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