Welcome again on fullonstudy. Today I’m going to discuss Excitation & Ionisation of atoms & molecules.
So let us start..
When energy is supplied to atoms & molecules, they absorb energy. It is noticed that energy absorbed as a definite value in case of particular type of atoms or molecules.
In excitation of atoms & molecules, the electron absorb energy & passed onto the higher state, i.e. the electron is excited to Ist, IInd states etc.
If more & more energy is given than a state wgich is when the electron of atom leaves the atom, the atom is ionised & process is called ionisation.
According to Bohr’s theory, when an electron in atom absorb energy from an external source, it goes to higher orbit & the atom is then said to be in excited state.
The state of excitation remains only for 10^-8 s and then electron jumps to lower state, emitting energy in the form of radiation /electromagnetic waves.
The potential difference through which excited electron falls is called resonance or excitation potential of the excited atom.
In case of Hydrogen, the energy level are given by :
If we excite electron from first state to second state then,
If we excite from first to third state then,
Hence, the successive excitation potentials of Hydrogen are 10.21, 12.10,…..eV respectively.
“The amount of energy required to detach the electron completely from atom, i.e. to raise the electron from n=1 to n=∞ is called ionisation energy “
This is the value of ionisation energy.
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