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Question

Which of the following statements concerning protium, deuterium and tritium is not true?

A
They are isotopes of each other
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B
They have similar electronic configurations
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C
They exist in the nature in the ratio of 1:2:3
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D
Their mass numbers are in the ratio of 1:2:3
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Solution

The correct option is C They exist in the nature in the ratio of 1:2:3
Protium is the most abundant isotope of hydrogen. The abundances of protium, deuterium and tritium are 99.984%, 0.016% and 1015% respectively. The ratio of protium to deuterium is 6400:1.

Thus, statement C is not true. But statements A, B and C are true. Protium, deuterium, and tritium are isotopes of hydrogen with mass numbers 1, 2 and 3. Their electronic configuration is 1s1 .

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