question_answer 63)

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

Answer:

Let there are 'x' electrons in the ion, then number of protons will be (x + 3). Number of neutrons = \[\frac{130.4\times x}{100}=1.304x\] Mass number = Number of neutrons + Number of protons \[56=1.304x+x+3\] \[53=2.304x\] \[x=\frac{53}{2.304}=23\] Atomic number = x + 3 = 26 Thus, the given element is iron. Symbol of its ion will be: \[\,_{26}^{56}F{{e}^{3+}}\]