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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.

A

`""_(34)^(81)Se`

B

`""_(35)^(81)Br`

C

`""_(36)^(81)Kr`

D

`""_(37)^(81)Rb`

Text Solution

Verified by Experts

The correct Answer is:
B
Mass number of the element = 81 i.e., p + n = 81
Let the number of protons be x.
Number of neutrons = `x+(31.7)/100xxx=1.317x
therefore" "x+1.317x=81" "0r" "2.317x=81
or x=81/(2.317)=34.958~~35`
Symbol of the element = `._(35)^(81)Br`
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