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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 ?

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1 : 1 : 1

4 : 1 : 1

3 : 2 : 1

2 : 1 : 1

answer is B.

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Detailed Solution

Average mass = (m + 0.5)
$= \frac{m \times 4 + (m + 1) \times 1 + (m + 2) \times 1}{6} = \frac{6 m + 3}{6}$

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