Bohr given a model for hydrogen molecule which is also applicable for some lighter atoms in which a single electron revolves around a stationary nucleus of positive charge Ze (called hydrogen like atom)

Bohr's model is based on the following postulates.

(i) The electron can revolve only in certain discrete non-radiating orbits, named stationary orbits, for which total angular momentum of the revolving electrons is an integral multiple of h/2π

i.e. L = h(h/2π) = mvr  where n = 1, 2, 3, ........= Principal quantum number

(ii) The radiation of energy happens only when an electron jumps from one permitted orbit to another.

When electron jumps from higher energy orbit (E₁) to lower energy orbit (E₂) then difference of energies of these orbits i.e. E₁ - E₂ emits in the form of photon. But if electron goes from E₂ to E₁ it absorbs the same amount of energy.

Radius of orbit : For an electron around a stationary nucleus the electrostatics force of attraction provides the necessary centripetal force

i.e.             ... (i)

also                          ... (ii)

Some other quantities

For the revolution of electron in n^th orbit, some other quantities are given in the following table

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