An ion with mass number 37 possesses one unit of negative charge. If the ion contains 11.1% more neutrons than the electrons, find the symbol of the ion

Explanation

As the ion carries one unit of negative charge, it will have one electron more than the number of protons
Let the number of electrons = x
Number of protons = x-1
Number of neutrons `= x + (x xx 11.1)/(100) = x + 0.111 x = 1.111x`
Solving for the value of x,
protons + neutrons = mass number
`x-1+1.111x = 37 " "x = (38)/(2.111) = 18`
Number of electrons = 18
Number of protons `= 18 - 1 = 17`
Number of neutrons = 37-17 = 20
The ion under discussion is chloride and its symbol is `Cl^(-)`.