Due to the emission of beta-particle by a Thorium nucleus, we get:
Correct answer: B. Protactinium
- A. Radium
- B. Protactinium
- C. Uranium
- D. Radon
Explanation
In this question, we are considering the process of beta decay, where a thorium nucleus emits a beta particle (an electron) and transforms into a different element. Specifically, Thorium (Th) has an atomic number of 90. Upon emitting a beta particle, the atomic number increases by one, resulting in Protactinium (Pa), which has an atomic number of 91.Here's why the other options are incorrect:Radium: Radium (Ra) has an atomic number of 88, which is lower than Thorium's atomic number, and it is not a product of beta decay from Thorium.Uranium: Uranium (U) has an atomic number of 92, which is higher than Thorium's. It cannot be formed directly from Thorium via beta decay.Radon: Radon (Rn) is a noble gas with an atomic number of 86 and is not related to the beta decay process of Thorium.
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