Chemistry, asked by sumana3636, 1 year ago

main postulates of Bohr atomic model​

Answers

Answered by Anonymous
9

Postulates of Bohr's atomic model :

  1. According to Bohr's theory , electrons revolve in definite circular orbits around the nucleus and these orbits are designated by the letters K, L, M, N or by the numbers 1, 2 ,3, 4 and so on.
  2. As long as the electrons revolve in a particular orbit they can neither gain energy nor loose energy. Such orbits are called as stationary orbits or stationary states.
  3. When an electron jumps from an higher orbit to a lower orbit it releases energy in the form of radiations and when an electron jumps from lower orbit to a higher orbit it absorbs energy in the form of radiations.
  4. The angular momentum of an electron is an integral multiple of h/ 2π mvr = nh/ 2π
  5. It explains the stability of an atom and also the line spectrum of hydrogen atom.
  6. In an atom, electrons(negatively charged) revolve around the positively charged nucleus in a definite circular path called as orbits or shells.
  7.  Each orbit or shell has a fixed energy and these circular orbits are known as orbital shells.
  8.  The energy levels are represented by an integer(n=1,2,3…) known as the quantum number. This range of quantum number starts from nucleus side with n=1 having the lowest energy level. The orbits n=1,2,3,4… are assigned as K,L,M,N… shells and when an electron attains the lowest energy state it is said to be in the ground state.
  9.  The electrons in an atom move from a lower energy state to a higher energy state by gaining the required energy and an electron moves from a higher energy state to lower energy state by losing energy.

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Answered by kingofclashofclans62
4

Answer:

Explanation:

The BOHR MODEL has an atomic consisting of a small positively charged nucleus orbited by negatively charged electron. here's a closer look at the bohr model which is sometimes called the RUTHERFORD BOHR MODEL.

niels bohr proposed the bohr model of the atom in 1915. the model number of atom is based on the quantum mechanics. the model contains some errors, but it is important because it describes most of the accepted features of atomic theory without all the levels of the modern vision. unlike earlier model bohr model explain the RYDBERG formula for the special emission lines of atomic hydrogen.

main points of bohr model》》

1. electrons Orbits the nucleus in Orbit that have a set size and energy.

2. the energy of the orbit is related to its size .the lowest energy is found in the smallest Orbit.

3. radiations is observed or emitted when an electron move from one Orbit to another.

problems of bohr model》》

1. it violates the Heisenberg Uncertainty Principle because its consider electron to have both are known radius and Orbit.

2. the bohr model provides an incorrect value for the ground state orbital angular momentum.

3. It make poor predictions regarding the specta of large atoms.

4. it does not predict the relative intensities of spectral lines.

5. it does not explain the zeeman effect.

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