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

An element with mass number 81 contains 31.7% more neutrons as compare

1.	An element with mass number 81 contains 31.7% more neutrons as compared to protons.Assign the sysmbol to the element.
Answer» Solution :An element can be identified by its atomic NUMBER only.Let us find the number.<BR>Let the number of protons=x `:.`Number of neutrons `=x+(x xx32.7)/(100)=(x+0.317x)` Now,mass no of element=NO. of protons+ No. of neutrons `81=x+x+0.317x=2.317x` or x=(81)/(2.317)=35 `:.`NO.of protons=35,No.of neutrons=81-35=46 The element with atomic number(Z)35 is `"BROMINE"_(35)^(81)Br.`