Bohr Energy Equation
### Formula:
$$E_n=-\frac{2.18\times10^{-18}Z^2}{n^2}J$$
### Terminologies:
- $$E_n$$ → Energy of electron in nth orbit.
- Z → Atomic number.
- n → Principal quantum number.
- J → Joule; SI unit of energy.
### Usage:
- Used to calculate energy of electron in hydrogen-like species.