Solved 2020 Question Paper ICSE Class 10 Physics — Question 19

The emission of alpha and beta particle is represented below:

$_{84}^{202}\text{X} \longrightarrow \space _{82}^{198}\text{Z} + \space _{2}^{4}\text{He} \text{ (α particle emission)} \\[2em] _{82}^{198}\text{Z} \longrightarrow \space _{83}^{198}\text{Y} + \space _{-1}^{\space \space \space 0}e \text{ (β particle emission)}$

∴ a = 83 and b = 198