Explain Bohr model of atom?
$$\bullet$$ Electrons revolve around the nucleus in fixed paths called orbits or shells.
$$\bullet$$ Electrons in each shell have definite energy hence shells are also called energy levels.
$$\bullet$$ As long as an electron revolves in a particular orbit its energy remains constant.
$$\bullet$$ The energy of the shell increases as the distance from the nucleus increases.
$$\bullet$$ The shells around the nucleus can be numbered from near the nucleus $$1,2,3,4 ....$$ or represented by the letters $$K, L, M, N$$