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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. Find the symbol of the element.

Text Solution

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Mass number of the element (p+n)=81
Let the number of protons =`x`
`:.` Number of neutrons present `=x+(31.7)/(100) xx x =1.317x`
`x+1.317 x=81 or 2.317x=81`
`x=(81)/(2.317)=35`
The element with 35 electrons (or Z=35) is bromine (Br)
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