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Question 3. What are the limitations of, Rutherford’s model of the atom?, , Answer: According to Rutherford’s model of, an atom the electrons are revolving in a, circular orbit around the nucleus. Any such, particle that revolves would undergo, acceleration and radiate energy. The revolving, electron would lose its energy and finally fall, into the nucleus, the atom would be highly, unstable. But we know that atoms are quite, stable., , Question 4. Describe Bohr’s model of the, atom., , Answer: Bohr’s model of the atom, , (1) Atom has nucleus in the centre., , (2) Electrons revolve around the nucleus., , (3) Certain special orbits known as discrete, orbits of electrons are allowed inside the, atom., , (4) While revolving in discrete orbits the, electrons do not radiate energy., , (5) These orbits or shells are called energy, levels., , (6) These orbits or shells are represented by, the letters K, L, M, N or the numbers n = 1, 2, 3,, 4, , N shell (n = 4), M shell (n = 3), L shell (n = 2), K Shell (n = 1), , Nucleus