Answered

When a radioactive isotope undergoes beta decay, which of the following will not occur?

Aenergy is released.
Bthe atomic number of the original nucleus changes.
Cthe mass number of the original nucleus changes.
Dthe original nucleus approaches greater stability.

Verified Answer :

Bthe atomic number of the original nucleus changes. Because in case of beta-decay process, proton in the parent nucleus decays into a neutron that remains in the daughter nucleus, and the nucleus emits neutrino and a positron( anti-electron). Hope it helps.
ysabayomi

Answer:

The correct option is c.

Explanation:

During radioactive decays, large amount of energy is released as the unstable nucleus attains more stability. A beta decay is a radioactive decay in which a positron (beta-positive, ⁰₊₁β) or an electron (beta-minus, ⁰₋₁β) is released. In both cases, the mass number of the original nucleus is not affected but the atomic number is affected as shown below.

An example of a beta-positive decay is

²³⁰₉₁Pa ⇒ ²³⁰₉₀Th + ⁰₊₁β

An example of a beta-minus decay is

³₁H ⇒ ³₂He + ⁰₋₁β

From the above, it can be observed that the mass number does not change.

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