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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. isotope of parent
3. isobar of parent
4. isodiapher of parent

Correct answer: isobar of parent

Solution

Each alpha particle emission decreases the mass number by 4 and the atomic number by 2, while each beta particle emission increases the atomic number by 1 without changing the mass number. Since the number of beta particles is twice the number of alpha particles, the net change in atomic number is zero, and the mass number remains unchanged. Thus, the daughter nucleus is an isobar of the parent nucleus.

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