Ncert Exercises & Solutions

When a nucleus in an atom undergoes a radioactive decay, the electronic energy levels of the atom:

1.	do not change for any type of radioactivity
2.	change for \(\alpha\) and \(\beta\text-\)radioactivity but not for \(\gamma\text-\)radioactivity
3.	change for \(\alpha\text-\)radioactivity but not for others
4.	change for \(\beta\text-\)radioactivity but not for others

Hint: The atomic mass and atomic number changes for

α

and

\(\beta\text-\)particle decay.

Explanation: \(\beta\text-\)particle carries one unit of negative charge and \(\alpha\text-\)particle carries \(2\) units of positive charge and \(\gamma\text-\)photon carries no charge, therefore electronic energy levels of the atom change for \(α\) and \(\beta\) decay, but not for \(\gamma\text-\)decay.

Hence, option (2) is the correct answer.

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