The correct option is
A 5626Fe3+Let the X and is represented as: 56ZX3+
Let the atomic number (Z)/ number of potons (p) be ′x′
Given: 3 units of positive charge
thus, number of electrons =x−3
Number of neutrons,n=30.4% more neutrons than electrons
n=(x−3)+30.4100×(x−3)
n=(30.4100+1)×(x−3)
n=1.304(x−3)
Mass number of X=56
Mass number of an atom=number of protons + number of neutrons
∴56=x+1.304(x−3)
or 56=2.304x−3.912
59.912=2.304x
x=26
Thus, number of protons (p) =x=26, element is Iron (Fe)
number of electrons (e) =x−3=26−3=23.
Therefore, symbol of the 5626Fe3+