Three isotopes of an element have mass n...

Three isotopes of an element have mass numbers `m, (m + 1) and (m + 2)`. If the mean mass number is `(m + 0.5)` then which of the following ratios may be accepted for `m,(m + 1) (m + 2)` in that order?

A

`1:1:1`

B

`4:1:1`

C

`3:2:1`

D

`2:1:1`

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The correct Answer is:

B

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