Question

Write the postulates of Bohr's atomic theory?

Answer 1

postulates of Bohr's atomic model :

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.

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.

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.

The angular momentum of aln electron is an integral multiple of h/ 2π mvr = nh/ 2π

It explains the stability of an atom and also the line spectrum of hydrogen atom

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Answer 2

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1️⃣ It states thatthe electrons move around nucleus in well defined paths called orbits or energy levels .

2️⃣ These orbits have a definite energy , and electrons in that orbit do not lose energy while revolving . Thus the orbits are called stationary states .

3️⃣ The electron only gains energy when it moves from lower energy level to higher one . It loses energy when it jumps from higher energy level to lower one.

4️⃣The frequency of radiation emitted or absorbed in any transition is given by the formula , $v = \dfrac{\triangle E}{h}=\dfrac{ E_2 - E_1}{h}$ .

5️⃣The angular momentum of the electron revolving around the nucleus is an integral multiple of $\dfrac{h}{2\pi}$. This means it is quantized and is given as the formula : $m_evr =n \dfrac{h}{2\pi}$

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