The energy of electrons in atoms is quantised

**Main
features of the quantum mechanical model of atom**

1. The energy of electrons in atoms is quantised

2. The existence of quantized electronic energy levels is
a direct result of the wave like properties of electrons. The solutions of
Schrödinger wave equation gives the allowed energy levels (orbits).

3. According to Heisenberg uncertainty principle, the exact
position and momentum of an electron can not be determined with absolute
accuracy. As a consequence, quantum mechanics introduced the concept of
orbital. Orbital is a three dimensional space in which the probability of
finding the electron is maximum.

4. The solution of SchrÖdinger wave equation for the
allowed energies of an atom gives the wave function ψ, which represents an
atomic orbital. The wave nature of electron present in an orbital can be well
defined by the wave function ψ.

5. The wave function ψ itself has no physical meaning.
However, the probability of finding the electron in a small volume dxdydz
around a point (x,y,z) is x proportional to |ψ(x,y,z)|^{2} dxdydz
|ψ(x,y,z)|^{2} is known as probability density and is always positive.

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