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Which of the following is not an isotope of hydrogen?

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in Chemistry – Class 11 by (148k points)
Which of the following is not an isotope of hydrogen?

(a) helium

(b) protium

(c) deuterium

(d) tritium

I got this question during an online interview.

I want to ask this question from Dihydrogen & H2 in portion Hydrogen of Chemistry – Class 11

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Best answer
The correct choice is (a) helium

To explain: Hydrogen exists in the form of three isotopes namely protium, deuterium and tritium. The atomic numbers of all the three isotopes of Hydrogen are same i.e. 1, but their symbols, relative atomic mass, density, etc vary.

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