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In Chemical Bonding , One Type Formation Of Covalent Bond Occurs By Overlapping Of Atomic Orbitals {Sigma} (s-s , s-p ,p-p ) ,Taking Z-Axis As Reference Axis , The Order Of Stability Is :[ p-p > s-p > s-s ] And Stability Is Directly Proportional To Bond Strength/Bond Energy/BDE . Example Of : s-s Bond [ H2 Molecule ] : s-p Bond [ HF Molecule ] : p-p Bond [F2 Molecule] "BUT" Order Of Bond Strength/Bond Energy/BDE Of These Molecules Is : HF (556 KJ/mol) > H2 (436 KJ/mol) > F2 (126 KJ/mol) i.e [ s-p > s-s > p-p ] HOW IS IT POSSIBLE ? Please Suggest Your Respective Answers .

In Chemical Bonding , One Type Formation Of Covalent Bond Occurs By Overlapping Of Atomic Orbitals {Sigma} (s-s , s-p ,p-p ) ,Taking Z-Axis As Reference Axis , The Order Of Stability Is :[ p-p > s-p > s-s ] 
And Stability Is Directly Proportional To Bond Strength/Bond Energy/BDE .
Example Of : s-s Bond [ H2 Molecule ]
: s-p Bond [ HF Molecule ]
: p-p Bond [F2 Molecule]
"BUT"
Order Of Bond Strength/Bond Energy/BDE Of These Molecules Is :
HF (556 KJ/mol) > H2 (436 KJ/mol) > F2 (126 KJ/mol) 
i.e [ s-p > s-s > p-p ]

HOW IS IT POSSIBLE ?

Please Suggest Your Respective Answers .

Grade:12th pass

2 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
9 years ago
her HF hs the highest bond dissociation energy because of two factors
(1)electronegativity difference
(2)hydrogen bonding
next consider the size factor sizo of H2<F2 molecule hence larger BDE
HERE don not consider the overlapping factor
Arpit
37 Points
9 years ago
Thank You For Your Answer Sir , But According To Your ?Statement And Applies Chemistry :
“What Will Be The Answer Of The Question : Arrange The Following In Decreasing Order Of Stability ::   σs-s . σs-p ,  σp-p ?

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