Question

Explain bohr's model of atom

Answer 1

1. positively charged nucleus is present in centre of atom
2. negatively charged electrons revolve around nucleus in certain paths called orbits
3. When electrons revolve in these paths they does not loose energy those orbits are called stationary orbits
4. They are named as k,l,m,n and so on

Answer 2

Hey there!

Answer:

In 1913, Bohr suggested a new model for the atom as Rutherford's atom model failed to account for the stability of the atom and the emission of line spectra by the atoms, such as hydrogen. He retained the essential features of Rutherford's atom model but in order to account for the stability of the atom and the line spectra of hydrogen atom, he introduced the concept of stationary orbits.

Postulates of Bohr's atom model:

1). In a hydrogen atom, the negatively charged electron revolves in a circular orbit around the heavy positively charged nucleus. The centripetal force required by the electron is provided by the attractive force exerted by the nucleus on it.

2). The electron can revolve round the nucleus only if those circular orbits in which the angular momentum of an electron is integral multiple of h/2p, where h is Planck constant.

While, revolving in such a orbit, the electron cannot radiates energy. Such orbits are called non - radiating or stationary orbits. Each stationary orbit is associated with a definite amount of energy.

If m and v are mass and velocity of electron in a permitted orbit of radius r given by:

mvr = $\dfrac{nh}{2\pi}$

Where n is called the principal quantum number and it has the integral values of 1,2,3,4......

This equation is also called as the Bohr's quantisation condition.

3). The energy is radiated, when an electron jumps from higher to lower energy orbit and the energy is absorbed, when it jumps from lower to higher energy orbit.

If $E_{i}$ and $E_{f}$ are the energies associated with the orbits of principal quantum number $n_{i}$ and $n_{f}$ respectively then the frequency of the radiation emitted is given by;

hv = $E_{i}$ - $E_{f}$

This equation is called the Bohr's frequency condition.


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