Neils Bohr, a Danish physicist in 1913 proposed a new model of atom. This new model is called Bohr's Model of atom. Postulates of Bohr's model of an atom 1) An atom consists of a small, heavy positively charged nucleus in the centre and electrons revolve around it in circular orbit. 2) The electrons revolve only in those orbits which have a fixed value of energy. … [Read more...] about Bohr’s Model of an atom