Which of the following do and which do not make sense ?
`7p, 2d, 3s^3, 3p_y^3, 4f`.

Explanation

To determine which of the given notations make sense based on quantum numbers, we need to analyze each one carefully. The notations include: `7p`, `2d`, `3s^3`, `3p_y^3`, and `4f`.

### Step-by-Step Solution:

1. **Understanding Quantum Numbers**:
- The principal quantum number (n) indicates the energy level and size of the orbital.
- The azimuthal quantum number (l) indicates the shape of the orbital:
- l = 0 corresponds to s,
...