An ion with mass number 56 contains 3 units of positive charge and 30.4% more neutrons than electrons. What would be the symbol of this ion?

Explanation

Suppose, the number of electrons present in the ion is x.
No. of neutrons in the ion
`=x+((x xx 30.4)/(100))=1.304x`
Since the ion contains 3 units of positive charge,
the number of electrons present in the parent atom =x+3
and, number of protons present in the parent atom =x+3
No. of protons =No. of neutrons =Mass number
`(x+3)+1.304x=56`
`2.304x=53`
`or x=(53)/(2.304)=23`
No. of protons =Atomic number `=x+3=23+3=26`
Hence the symbol of the ion is `""_(26)^(56)Fe^(3+)`.