Question

Neil bohr postulate​

Answer 1

Answer:

Bohr's Postulate :

1} An atom has a number of stable orbits in which an electron can reside without the emission of radiant energy. Each orbit corresponds, to a certain energy level.

2} An electron may jump spontaneously from one orbit (energy level E1) to the other orbit (energy level E2) (E2 > E1); then the energy change AE in the electron jump is given by Planck’s equation

∆E = E2 -E1 = hv

Where,

h = Planck’s constant

v = frequency of light emitted.

3} The motion of an electron in a circular orbit is restricted in such a manner that its angular momentum is an integral multiple of h/2π, Thus

mvr = nh/2π, where m = mass of the electron

v = velocity of the electron

r = radius of the orbit

n = an integer called principal quantum number of the electron.

4} A special surface around nucleus which contained orbits of equal energy and radius was called shell. These shells are numbered from inside to outwards as 1, 2, 3, 4 etc. and called K, L, M, N etc., respectively.

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