Question

A radioactive nucleus decays as \(X \overset{\alpha}{\longrightarrow} X_{1} \overset{\beta^{-}}{\longrightarrow} X_{2} \overset{\alpha}{\longrightarrow} X_{3} \overset {\gamma}{\longrightarrow} X_{4}\)
If the mass number of X is 180 and atomic number is 72, then calculate the mass number and atomic number of X₄.

Answer 1

Atomic number of X₄ = 69
Mass number = 172