After emitting an a particle, what will happen to daughter nuclei
**Core Concept**
Radioactive decay is a process in which unstable atomic nuclei lose energy by emitting radiation. Alpha (α) decay is a type of radioactive decay where an alpha particle (two protons and two neutrons) is emitted from the nucleus, resulting in a more stable daughter nucleus. This process occurs in heavy elements and is a key concept in nuclear medicine and radiation oncology.
**Why the Correct Answer is Right**
When an alpha particle is emitted, the daughter nucleus has two fewer protons and two fewer neutrons than the parent nucleus. This results in a decrease in the atomic number (Z) by two and a decrease in the mass number (A) by four. The daughter nucleus will have a more stable electronic configuration and a lower energy state, which is why alpha decay is a common mode of radioactive decay for heavy elements.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because alpha decay does not result in an increase in the atomic number (Z) of the nucleus. The atomic number remains the same, but the mass number (A) decreases by four.
**Option B:** This option is incorrect because beta decay (not alpha decay) is associated with the emission of a beta particle (either a positron or an electron) from the nucleus, not an alpha particle.
**Option C:** This option is incorrect because gamma decay (not alpha decay) is associated with the emission of gamma rays (high-energy photons) from the nucleus, not an alpha particle.
**Clinical Pearl / High-Yield Fact**
In nuclear medicine, alpha particles are used in targeted alpha therapy (TAT) to selectively kill cancer cells. This approach is particularly effective for certain types of cancer, such as prostate cancer.
**Correct Answer: D. Daughter nuclei will have a lower atomic number (Z) by two and a lower mass number (A) by four.**