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An element with mass number 81 contains ...

An element with mass number `81` contains `31.7%` more neutrons as compared to protons. Assign the atomic symbol.

Text Solution

Verified by Experts

We know
Mass number = No. of protons + No. of neutrons = 81
i.e., `" " p + n = 81`
Let number of protons = x
Number of neutrons = `x + (x xx 31.7)/(100)`
`" " = 1.317 x`
`:. " " x + 1.317 x = 81`
`x = 81/2.317 = 34.96 = 35`
Symbol = `""_(35)^(81)Br`.
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