A radioactive decay can form an isotope of the original nucleus with the emission of particles

Options

A. 3 `beta`- particles
B. 2 `beta`- particles and 1 `alpha`- particle
C. 2 `beta` - particles and 1 `gamma`- particle
D. 2 `alpha`-particles and 1 `beta`- particle.

Answer

B

Explanation

A nucleus is denoted by `_(z)X^(A)`
An isotope should have same Z.
`alpha`- particle = `._(2)He^(4)`, `beta`- particle = `._(-1)beta^(0)`
The emission of one `alpha` particle and the emission of two `beta` particles maintain the Z same.
Hence for isotope formation `2beta` particles and one `alpha` particle are emitted.