Question

What is sigma bond ? Explain s-s overlapping and p-p overlapping .​

Answer 1

Explanation:

Sigma bonds are further classified as s-s , s-p & p-p bonds. s-s bonds are formed by overlapping of two s orbitals. p-p sigma bond is formed by overlapping of two p orbitals and. s-p sigma bonds are formed by overlappig of one s and one p orbita.

Answer 2

$\underline{\red{\rm Sigma \ Bond \ :- }}$

• If the overlaping is done along the nuclear axis ( head on overlaping ) , it forms sigma bond.

$\bf s-s \ overlapping :-$

• When two s-s orbitals overlap along the nuclear axis .
• For ex - $\sf H_2$

$\bf p-p \ overlapping :-$

• When two p-p orbitals overlap ( Pz - Pz overlapping ) .
• For ex - $\sf F_2$

Note :-

• Pz orbital is present at nuclear axis therefore it always forms $\sigma$ bond , while Px and Py forms π bond.

( See attachments )