Energy Dependence on Atomic Number

### Formula:

$$E_n\propto-\frac{Z^2}{n^2}$$

### Terminologies:

- $$E_n$$ → Energy of electron in nth orbit.

- Z → Atomic number.

- n → Principal quantum number.

- Negative energy → Represents electron bound to nucleus.

### Usage:

- Used to compare energies of electrons in different hydrogen-like species.