A U F B A U PRINCIPLE
A u f b a u Principle means "building up" in German. This principle describes a hypothetical process in w/c the electrons are imagined as entering the atomic orbitals one by one.
Order in which orbitals are fixed with electrons.
(It is Shown in The first picture).
Max. # of Electrons for each sublevel
(It is shown at the second Picture).
ADDITIONAL INFORMATION:
What is chemistry?
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