Question

What is unabbreviated and abbreviated electronic configuration?

Answer 1

We have to know that the electronic configuration of Elements is the distribution of electrons within the orbitals of its atom which relates to its chemical and physical properties. In an atom electrons revolve around the nucleus in a circular orbital path and carry negative charge.

Complete answer:
We will define the following electronic configurations:
Abbreviated Electronic Configuration: starts from the last noble gas electronic configuration before you reach the element you are trying to write.
Unabbreviated Electronic Configuration: starts from the very beginning of the periodic table and continues all the way to your element. It is much longer and more time-consuming.
For example: Since Magnesium is a neutral atom and the atomic number for magnesium is $12$.
The unabbreviated electron configuration for magnesium is
$1{s^2}2{s^2}2{p^6}3{s^2}$
Abbreviated electron configuration:
Typically after the 18th element Argon we can use a shorthand or abbreviated version of the system by using what is referred to as Noble Gas notation.
We use the Noble gas because we know the element's electron orbital is completely full to the point.
For example in case of calcium:
$Ca = *1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}*4{s^2}$
The electronic configuration of argon with eighteen electrons can be represented as:
$Ar = 1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}$
We can therefore replace this section with the Noble Gas Notation $[Ar]$ in the Calcium configuration.
Ca=$* [Ar] * 4{s^2}$

Note:
So from this we can infer about both the electronic configurations well also electron configurations are the summary of where the electrons are around a nucleus. As we learned earlier, each neutral atom has a number of electrons equal to its number of protons.