Question

Examine Figure 1. During the process of beta decay, which statement correctly compares the parent nucleus and the daughter nucleus?

A
The parent has a different mass number than the daughter.

B
The parent has a different atomic number than the daughter.

C
The parent has the same number of neutrons as the daughter.

D
The parent has the same number of electrons as the daughter.

Answer 1

Beta decay forms a daughter nucleus with a different atomic number than the parent nucleus. The correct answer is option B.

A nucleus loses an electron when it emits the beta particles. The parent and daughter nuclei share the same atomic mass because the mass of an electron is so much less than that of a proton or neutron. The offspring nucleus has an atomic number that is one higher than the parent nucleus.

There are mainly two types of beta decay: beta plus (positron decay) and beta minus (electron decay). The daughter atomic number reduces by one after beta plus decay (the nucleus loses one positive charge) and rises by one after beta minus decay (the nucleus loses one negative charge).

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