What are the postulates of Boh's mode / of an atom?
Answers
postulates of Bohr's model of an atom are :
1. an atom consists of small heavy positively charged nucleus in Centre surrounded by electrons and electron revolves around the nucleus in selected circular path called orbits.
2. each orbit is associated with a definite energy called energy level such as K,L,M,N
3. energy of an electron in Orbit does not change with time.
4. only those orbits are permitted in which angular momentum is a whole number multiple of h/2π.
5. energy is emitted or absorbed only when the electron jumps from one energy level to another.
Answer:
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Explanation:
Postulates of Bohr's theory of hydrogen atom
1. NUCLEAR CONCEPT :An atom consists of a small and massive central core, called nucleus around which planetary electrons revolve. The centripetal force required for their rotation is provided by the electrostatic attraction between the electrons and the nucleus.
2. QUANTUM CONDITION :Of all the possible circular orbits allowed by the classical theory, the electrons are permitted to circulate only in those orbits in which the angular momentum of an election is an integral multiple of h/2 pye, h being Planks constant. Therefore, for any permitted orbit,
L=mvr =nh/2PYE , n=1,2,3……
WheWhere L, m, and v are the angular momentum, mass and speed of the electron, r is the radius of the permitted orbit and n is positive integer called principal quantum no. The above equation is Bhor’s famous quantum condition.
3. STATIONARY ORBITS :While revolving in the permissible orbits, an electron does not radiate energy. These non - radiating orbits are called stationary orbits.
4. FREQUENCY CONDITION :An atom can emit or absorb radiation in the form of discret energy photons only when an electron jumps from a higher to a lower orbit or from a lower to a higher orbit, respectively. hv=E1-E2.
TThis is Bhor’s famous frequency condition.
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