Electronic configuration of LITHIUM(Li) || Condensed electronic configuration of Lithium

This video explains writing electronic configuration of Lithium using s,p,d,f notation, orbital diagram & condensed form.
The arrangement of electrons in the different shells of an atom is called electronic configuration.
To write electronic configuration , calculate the number of electrons from atomic number of an element.

s, p, d & f notation
The number of electrons present in sub shell is depicted as super script & similar sub shell is differentiated by writing the principal quantum number before the sub shell
Lithium( 3) = 1s22s1

orbital diagram
Each orbital is represented as a box and the electron is represented by an arrow.

condensed electronic configuration
We can simplify the electronic configuration of Lithium by representing total number of electrons in the first shell by the name of Helium.The electrons in Helium are called core electrons & the electrons in the highest principal quantum number are called valence electrons.

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