Total number of nodes present in 5p energy level is :

Options

A. 6
B. 5
C. 4
D. 3

Answer

To find the total number of nodes present in the 5p energy level, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Principal Quantum Number (n)**:
- For the 5p energy level, the principal quantum number \( n \) is 5.

2. **Identify the Azimuthal Quantum Number (l)**:
- For a p orbital, the azimuthal quantum number \( l \) is 1.

3. **Calculate the Number of Angular Nodes**:
- The number of angular nodes is given by the formula:
\[ \text{Number of Angular Nodes} = l \]
- Substituting the value of \( l \):
\[ \text{Number of Angular Nodes} = 1 \]

4. **Calculate the Number of Radial Nodes**:
- The number of radial nodes is given by the formula:
\[ \text{Number of Radial Nodes} = n - l - 1 \]
- Substituting the values of \( n \) and \( l \):
\[ \text{Number of Radial Nodes} = 5 - 1 - 1 = 3 \]

5. **Calculate the Total Number of Nodes**:
- The total number of nodes is the sum of angular nodes and radial nodes:
\[ \text{Total Nodes} = \text{Number of Angular Nodes} + \text{Number of Radial Nodes} \]
- Substituting the values:
\[ \text{Total Nodes} = 1 + 3 = 4 \]

### Conclusion:
The total number of nodes present in the 5p energy level is **4**.

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