Question

An element with mass number 15, contains 14.2% more neutrons as compared to protons. Symbol of atom is

Answer 1

Let x be the number of protons.

The number of neutrons is x+0.317x=1.317x.

The mass number is 81.

It is equal to the sum of the number of protons and the number of neutrons.

81=x+1.317x=2.317x

x=35

Hence, the symbol is

35

81

Br.

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