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Question

Which of the following pair(s) is/are isodiaphers?

A
146C and 2311Na
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B
2412Mg and 2311Na
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C
42He and 158O
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D
199F and 136C
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Solution

The correct option is D 199F and 136C
Isodiaphers are species with different atomic numbers and mass numbers, but with the same number of neutrons in excess.
199F and 136C have different atomic numbers and different mass numbers.
Calculating the difference (n – p),
Number of neutrons (n) in 199F= 19 – 9 = 10, number of protons (p) = 9 So,
n – p = 1
Number of neutrons (n) in 136C = 13 – 6 = 7, number of protons (p) = 6. So,
n – p = 1

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