The total number of electrons in a 4d subshell are

Options

A. 14
B. 7
C. 10
D. 32

Answer

To find the total number of electrons in a 4d subshell, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Principal Quantum Number (n)**:
- The principal quantum number (n) for the 4d subshell is 4. This indicates the energy level of the electrons.

2. **Determine the Azimuthal Quantum Number (l)**:
- For d orbitals, the azimuthal quantum number (l) is equal to 2. This is a characteristic of d subshells.

3. **Calculate the Number of Orbitals**:
- The magnetic quantum number (m_l) for a given l value can range from -l to +l.
- For l = 2 (d subshell), m_l can take values: -2, -1, 0, +1, +2.
- This gives us a total of 5 orbitals (one for each value of m_l).

4. **Determine the Maximum Number of Electrons**:
- Each orbital can hold a maximum of 2 electrons (due to the Pauli exclusion principle).
- Therefore, the total number of electrons that can be accommodated in the 4d subshell is calculated as follows:
\[ \text{Total Electrons} = \text{Number of Orbitals} \times \text{Electrons per Orbital} = 5 \times 2 = 10 \]

5. **Conclusion**:
- The total number of electrons in the 4d subshell is **10**.

### Final Answer:
The total number of electrons in a 4d subshell is **10**.

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