Class 11 Chap 2 | Atomic Structure | Quantum Numbers | JEE / NEET
2 minute read
objectives
1.discover electron,proton and neutron and their characteristics.
2.describe thomson rutherford and bohr's atomic model.
3.quantum mechanical of model of atom
4.nature of electromagnetic radiation and planck's quantum theory.
5.photoelectric effect and describe features of atomic spectra.
6.state the de broglie relation and heisenberg uncertainty principle:
7.state amban principle,pauli exclusion principle and hund's rule of maximum
multiplicity and
8.write the electronic configuration of atom
Class 11 Chap 2 | Atomic Structure 05 | Quantum Numbers | Pauli's Exclusion Principle | JEE / NEET
1)Bohr ---- electron is a particle moving around the Nucleus.2)De brogli and hesinburg said that electron is a wave in nature.
Wave mechanical model of atom
1)Electron is a wave(matter wave).
2)Schrodinger GAVE electron wave equation (Electron probability wave.)
Quantum mechanical model of atoms.
1) ZAHI squares the probability to find an electron.
Get
....three variables (dimensions) quantum numbers.
Solution to the Schrodinger e- wave equation gives 3 variables
------> represent the position of electrons (e-) those positions
where probability of finding an electron is maximum.
Three quantum numbers are the three variables n,l,m,s.
Quantum numbers(4 numbers)
1)n,(principle quantum number)
2)l,(azimuthal quantum number)
3)m,(magnetic quantum number)
4)s(spin quantum number)
These four numbers together give the location of electrons. Will tell the
probability where the probability.
When electrons form waves they do not revolve in orbit or shell they are
found in orbital.
Electrons are found in orbitals not in orbit.
Orbital- three dimensional space
where probability of electron is
maximum.
Orbital has a different shape,size,orientation.
Now let's discuss
(n) Quantum Number
-n:principle quantum number ,where n is not equal to 0.
When n =1 then k2 L shell
3 M shell
4 N shell
It tells the size of the orbital.
When we go far from the nucleus, energy increases.
Enth=-13.6*Z2/n2 ev
Second quantum number is
i:Azimuthal/angular momentum quantum number
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