1.

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

Answer»

do not change for any type of RADIOACTIVITY
change for `alpha` and `BETA` radioactivity but not for `gamma`-radioactivity
change for `alpha`-radioactivity but not for others
change for `beta`-radioactivity but not for others

Solution :As an alpha particle carries 2 UNITS of positive charge, and a beta particle carries one UNIT of negative charge and `gamma` particle carries no charge , therefore electronic energy levels of the atom change for `alpha` and `beta`radioactivity , but not for `gamma`- radioactivity .


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