Magic number elements are those isotopes of elements

Options

A. In which the number of protons or neutron is 2,8,20,28,50,82, or 126
B. Which are relatively more abundant
C. Which are unusually stable
D. All of equal

Answer

To answer the question regarding magic number elements, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding Magic Numbers**:
- Magic numbers refer to specific numbers of nucleons (protons and neutrons) in an atomic nucleus that result in a more stable configuration. These numbers correspond to complete shells within the nucleus.

2. **Identifying Magic Numbers**:
- The known magic numbers are: 2, 8, 20, 28, 50, 82, and 126. These numbers indicate the number of protons or neutrons that lead to enhanced stability of the isotopes.

3. **Stability of Isotopes**:
- Isotopes that have a magic number of protons or neutrons are generally more stable than those that do not. This stability is due to the complete filling of nuclear shells, which minimizes the energy of the system.

4. **Conclusion**:
- Therefore, magic number elements are those isotopes of elements where the number of protons or neutrons equals one of the magic numbers listed above.

5. **Choosing the Correct Option**:
- Based on the explanation, if the question provides options, the correct answer would be the one that lists the magic numbers or indicates isotopes with these numbers.