Nuclei - Result Question 72

73. 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

[2009]

(a) isomer of parent

(c) isotope of parent

(b) isotone of parent

(d) isobar of parent

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Answer:

Correct Answer: 73. (c)

Solution:

  1. (c) A radioactive substance when emits one alpha particles $( _2^{4} He)$, its mass number reduces by 4 and charge no. reduces by 2 and after emission of two $\beta$-particles its charge no. increase by 2 thus the charge no. i.e. atomic number remains the same.

Isotopes of an element have the same atomic number but different mass number.