Question

what is Bhor theory?​

Answer 1

Correct question:

What is Bohr Theory?

⇒ Bohr theory states that the energy  of an electron of an atom depends on the size of the orbit and is lower for smaller orbits.

The Bohr model is based on the energy levels of one electron orbiting a nucleus at various energy levels. Any other electrons in the atom will repel the one electron and change its energy level. Bohr proposed his quantized shell model of the atom to explain how electrons can have stable orbits around the nucleus by observing a hydrogen atom and at the center he found the nucleus consists of only 1 proton and the atom was with only 1 electron as well in a single shell.

And each orbit of an atom is corresponding with its respective shell and later on this idea had an effective result in case of the atoms of every element but the number of electrons and protons may varies. And except hydrogen, in case of other elements in the nucleus there was the presence of neutron as well along with the protons.

He proposed this idea in the year of 1931 and it is the principle of quantam physics as well.

Answer 2

Bhor's Theory of atom or bhor's atomic theory:-

•   The electron is able to revolve in certain stable orbits around the nucleus without radiating any energy, contrary to what classical electromagnetism suggests. These stable orbits are called stationary orbits and are attained at certain discrete distances from the nucleus. The electron cannot have any other orbit in between the discrete ones.

•    The stationary orbits are attained at distances for which the angular momentum of the revolving electron is an integral multiple of the reduced Planck's constant: m e v r = n ℏ  , where n = 1, 2, 3, ... is called the principal quantum number, and ħ = h/2π. The lowest value of n is 1; this gives a smallest possible orbital radius of 0.0529 nm known as the Bohr radius. Once an electron is in this lowest orbit, it can get no closer to the proton. Starting from the angular momentum quantum rule, Bohr[2] was able to calculate the energies of the allowed orbits of the hydrogen atom and other hydrogen-like atoms and ions. These orbits are associated with definite energies and are also called energy shells or energy levels. In these orbits, the electron's acceleration does not result in radiation and energy loss. The Bohr model of an atom was based upon Planck's quantum theory of radiation.

•    Electrons can only gain and lose energy by jumping from one allowed orbit to another, absorbing or emitting electromagnetic radiation with a frequency ν determined by the energy difference of the levels according to the Planck relation: Δ E = E 2 − E 1 = h ν, where h is Planck's constant.