Austrian physicist Wolfgang Pauli proposed his principle after observing atoms in excited state. It became Pauli’s exclusion principle. He considered the repulsive force between two negatively charged electrons and proposed new model indicating upward and downward spin electrons in boxes.
Importance and definition of Pauli’s exclusion principle
It has great importance in predicting types of chemical bonds and even upcoming element in periodic table. So, let’s see the Pauli’s principle in detail.
Pauli’s exclusion principle states that maximum two electrons can occupy a single atomic orbital, only if electrons have opposite spins.
Presentation of electrons in atomic orbits
Electrons in an atom can be represented by box and arrow model. Each election has an associated spin. Electron in a box having upward arrow shows an electron spinning in one direction.
On the other hand downward arrow in a box shows that electron spinning in apposite direction. An empty box represents unoccupied atomic orbital.
It also states that no two electrons have equal quantum numbers in an atom.
Purpose of Pauli’s exclusion principle
In the field of chemical bonding and prediction of chemical behaviour of elements or atoms Pauli’s principle has immense importance. It helps to predict type of bond going to be formed in a chemical reaction.
This principle can predict the structure of the atom. It can predict which atom or element will come in the periodic table. It means this exclusion principle can predict the elements in the periodic table.
Elements having more nucleon and electrons are less stable. In this case, Pauli’s principle describes the stability of higher elements including radio active elements.
Application of Pauli’s exclusion principle
It is applicable in case of fermions which having half integer spin but not applicable to the bosons.
According to this principle no two electrons in an atom have equal quantum numbers. This helps to develop a model for periodic table.
Electron degeneracy and neutron degeneracy ican govern the collapse of a star into the white dwarf stage and neutron star stage respectively.
Short summary of Pauli’s principle
Wolfgang Pauli was a Australian physicist who developed his principle to develop a model for periodic table.
His principle states that no two electrons in an atom have equal quantum numbers.
Also, it helps to predict type of bond going to be formed in a chemical reaction.
Pauli’s principle is applicable in case of fermions which having half integer spin but not applicable to the bosons.
Solved questions on Pauli’s principle
Here are some useful solved questions on the Pauli’s principle. Just take a look at the following solved questions.
Q.1.What is Pauli’s exclusion principle?
Ans: Austrian physicist Wolfgang Pauli proposed his principle. According to this principle no two electrons in an atom have equal quantum numbers. This helps to develop a model for periodic table.
Q.2. What is the importance of Pauli’s exclusion principle?
Ans: It helps to predict type of bond going to be formed in a chemical reaction. This principle can predict the structure of the atom. It shows which atom or element will come in the periodic table. It means this exclusion principle can predict the elements in the periodic table.
Q. 3. What is the application of Pauli’s exclusion principle?
Ans: It is applicable in case of fermions which having half integer spin but not applicable to the bosons. According to this principle no two electrons in an atom have equal quantum numbers. This helps to develop a model for periodic table.
Explanation of Aufbau’s Principle
Rational and irrational numbers