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

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Let the no. of electrons in the ion = x 

the no. of the protons = x + 3 (as the ion has three units positive charge) 

and the no. of neutrons = x + 30.4x/100 = x + 0.304 x 

Now, 

mass number of ion = Number of protons + Number of neutrons

= (x + 3) + (x + 0.304 x) 

∴ 56 = (x + 3) + (x + 0.304 x) or 2.304 x = 56 – 3 = 53

x = 53/2.304 = 23

Atomic number of the ion (or element) = 23 + 3 = 26 

The element with atomic number 26 is iron (Fe) and the corresponding ion is Fe3+ .

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