After emission of a β-particle, the nucleus :

The correct answer is option 2) i.e. A, Z+1.

CONCEPT:

• Radioactive decay: Radioactive decay is the spontaneous breakdown of the nucleus of an atom along with the release of energy and matter from the nucleus.
  • Beta Decay: The radioactive decay in which the parent nucleus emits an electron and an antineutrino and converts a neutron to a proton.

The equation for β-decay is given by:

 \(_{Z}^{A}\textrm{X}\rightarrow _{Z+1}^{A}\textrm{Y}+e^{-} +\bar{\nu }\)

Where X is the parent nucleus, Y is the daughter nucleus, A is the atomic mass, Z is the atomic number, e- is the electron, \(\bar\nu\) is the antineutrino.

EXPLANATION:

• Therefore, the nucleus after emission has no change in mass A and attains atomic number Z + 1.