Question

what was Bohr's postulate on revolution of electrons in the orbits of atom?​

Answer 1

Neil bohr's postulate on revolution of electrons in the orbits of atom was as follows:-
(1) they move in fixed orbits or paths which are known as 'shells'.
(2) they don't radiate their energy ( because if they did they will vanish in the nucleus but this used to happened only in rutherford's model of atom )
3) the shell closest to the nucleus will contain atom with low energy and the shell far from the nucleus will contain atom with high energy.