The correct expression derived for the energy of an electron in the `n^(th)` enegry level is for H-atom :

The correct expression derived for the energy of an electron in the n^(th) energy level is for H-atom :

Derive the expression for the energy of an electron in the atom.

Write the expression for total energy of an electron in n^(th) orbit.

The energy of electron in the n^(th) Bohr orbit of H-atom is

State Bohr's postulates. Using these postulates, derive an expression for total energy of an electron in the n^("th") orbit of an atom. What does negative of this energy signify ?