The number of beta particles emitted by a radioactive substance

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The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an

1. isomer of parent
2. isotone of parent
3. isotope of parent
4. isobar of parent

Correct Option: C

Isotopes of an element have the same atomic number but different mass number. A radioactive substance when emits one alpha particles ⁴_{2He , its mass number reduces by 4 and charge no.reduces by 2 and after emission of two β-particles its charge no. increase by 2 thus the charge no. i.e. atomic number remains the same.}