# Formula Rydberg energy formula for H atom Binding energy Quantum number

## Binding energy

`$$ W $$`Unit

`$$ \mathrm{J} $$`

Energy required to knock an electron, which is in the \( n \)-th state, out of the hydrogen atom. For example, the binding energy of the electron in the ground state is \( n = 1 \): \( 13.6 \, \mathrm{eV} \).

## Quantum number

`$$ n $$`Unit

`$$ - $$`

Principal quantum number is an integer indicating an energy level of the H atom. The electron in the H atom can occupy this energy state, which is characterized by \(n\).

Here is:

- \( n = 1 \) is the ground state.
- \( n = 2 \) is the first excited state.
- \( n = 3 \) is the second excited state.
- and so on...