An element with mass number 81 contains 31.7% more neutrons as compared to protons. Find the symbol of the atom.

_{34}^{81} S e

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_{35}^{81} B r

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_{36}^{81} K r

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_{37}^{81} R b

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Solution

The correct option is B $_{35}^{81} B r$
Mass number of the element =81
i.e. $p + n = 81$
Let the number of protons be x.

Number of neutrons = $x + \frac{31.7}{100} \times x = 1.317 x$

$∴ x + 1.317 x = 81$ or $2.317 x = 81$

or $x = \frac{81}{2.317} = 35$

Symbol of the element = $_{35}^{81} B r$

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