Chemistry

Problem

An ion with mass number 56 contains 3 units of positive charge and 30.4% more neutrons than electron, then the symbol of ion is 1)

{}^{56}_{26}\text{Fe}

{}^{56}_{26}\text{Fe}^{+}

{}^{56}_{26}\text{Fe}^{+2}

{}^{56}_{26}\text{Fe}^{+3}