NCERT Exercise 11 - Structure of the Atom

Question: The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes ¹⁶₈X and ¹⁸₈X in the sample?

Answer: ¹⁶X = 90%; ¹⁸X = 10%.

Full step-by-step NCERT solution with diagrams on Something by Zero.