# An Ion with Mass Number 56 Contains 3 Units of Positive Charge and 30.4% More Neutrons than Electrons. Assign the Symbol to this Ion. - Chemistry

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

#### Solution

Let the number of electrons present in ion A^(3+) be" "x

∴ Number of neutrons in it = x + 30.4% of = 1.304 x

Since the ion is tripositive,

⇒ Number of electrons in neutral atom = x + 3

∴ Number of protons in neutral atom = x + 3

Given,

Mass number of the ion = 56

:.(x + 3) + (1.304x)=56

2.304 x = 53

x =53/2.304

x =23

∴ Number of protons = x + 3 = 23 + 3 = 26

∴ The symbol of the ion ""_26^56Fe^(3+)

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#### APPEARS IN

NCERT Class 11 Chemistry Textbook
Chapter 2 Structure of Atom
Q 44 | Page 67