General Introduction, Electronic Configuration, Tendency for Catenation

General formula is ns2np2
Carbon — [He]2s22p2
silicon — [Ne]3s23p2
Germanium — [Ar]4s24p23d10
Tin — [Kr]4d105s25p2
Lead — [Xe] 4f145d106s26p2

Allotropy : An element having same chemical formula different physical properties is called allotropy.
Reason : Arrangement of atoms are different.

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Part2: View the Topic in this Video from 0:07 to 13:31

Part3: View the Topic in this Video from 0:08 to 8:48

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