Energy Required for Electronic Transition

### Formula:

$$\Delta E=2.18\times10^{-18}Z^2\left(\frac{1}{n_1^2}-\frac{1}{n_2^2}\right)J$$

### Terminologies:

- ΔE → Energy difference between two energy levels.

- Z → Atomic number.

- $$n_1$$ → Initial energy level.

- $$n_2$$ → Final energy level.

- J → Unit of energy.

### Usage:

- Used to calculate energy absorbed or released during electron transition.