What is SP3 hybridisation ?

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Answer:-
When all the four orbitals of L-shell (2S,2Px,2Py,2Pz) get mixed up, four SP3 hybrid orbitals result.They are exactly similar in shape and are directed to the four corners of regular tetrahedron.The bond angle in it is 109⁰28'.Each SP3 orbital has 25% S-character and 75% P-character.
What is SP3 hybridisation ?

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