Must Know Hacks of Electronic Configuration problems

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Do you wish to know how electrons are located around the nucleus of the atom?

“Protons give an atom its identity, electrons its personality.”

 

― Bill Bryson, A Short History of Nearly Everything
 

 

Basic Concepts in Electronic Configuration:

 

Bohr’s model :

Niels Bohr suggested the atomic model on the basis Of various energy levels for electrons around the nucleus.  These energy levels are called shells. 


Electronic shell :

The energy levels around the nucleus are called electronic shells. They are designated and K, L, M and so on. Each energy level has a certain energy value and radius in which electrons revolve around the nucleus.


Subshells and orbitals:

Electronic shells further classified as subshells. They are represented as s, p, d and f-subshell. Each subshell has a certain number of orbitals and each orbital can accommodate a maximum of 2 electrons.


 The distribution of electrons in shell,  subshell and orbitals is shown as below:

 

 

Electronic configuration:

It is the distribution of electrons in various orbitals on the basis of their energy. On the basis of various electronic rules, the sequence can be shown as given below:
 

 

 

 

Hund’s rule:

It states that every electron in a subshell will be single occupied until the empty orbitals are available in the same subshell.


Aufbau principle:

It states that electrons always occupy the lower energy level and then move to higher energy levels. 


Pauli’s exclusion principle:

It states that no two electrons in an atom can have the same quantum numbers.


Quantum numbers:

The set of numbers that is used to explain the energy and position of electrons in an atom is known as quantum number.

 
There are 4 quantum numbers:

 

Principle quantum number:

It is used to calculate the energy and shell number of electrons. It is represented as “n”.


Azimuthal quantum number:

It is used to calculate the position of an electron in a certain subshell and denoted by ‘????’.


Magnetic quantum number:

It represents the magnetic moment of an electron and denoted by ‘m’.


Spin quantum number:

It is related to the spin of an electron and denoted by ‘s’. The value of ‘s’ is always +½ or -½ .

 

 

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Just like the bees buzz around the beehive similarly our dear little electrons are making circles around the nucleus or are in random states of motion. Moreover, just like the negatively charged electrons; electronic configuration questions can leave the students a little flustered as well. But to bring about some order and stability in this equation we have the most reliable assignment solvers at your service.

 

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Let’s write down all probabilities where a given electron might be at any given point. 

 

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