In which of the following orbitals , the sum of `( n+l)` value is lowest ?
`4s, 3d, 4p`

Explanation

To determine which of the given orbitals has the lowest value of \( n + l \), we will follow these steps:

### Step 1: Identify the orbitals and their corresponding \( n \) and \( l \) values.
- For the orbital **4s**:
- \( n = 4 \) (the principal quantum number)
- \( l = 0 \) (the azimuthal quantum number for s orbitals)

- For the orbital **3d**:
...