Electronic configuration: The shorthand notation consists of the principle energy level(n value),the letter representing sub-level (l value), and number of electrons (x) in the sub-shell is written as a superscript as shown below: For Hydrogen atom (H) having atomic number (Z)=1 ,the number of electrons is one ,then the electronic configuration is: For-many electrons of atom ,we must know the electronic configurations of atoms.The distribution of electrons in various atomic orbitals provides an understanding of electronic behaviour of the atom and,in turn,its reactivity.Let us consider the Helium atom. To describe the electronic configuration for more than one electron in atom ,we need three principles: Those are the: Pauli Exclusion Pri...
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