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Question
Identify the type of overlap present in H2. Explain diagrammatically.
Solution
s–s σ overlap:
- The overlap between two half-filled s orbitals of two different atoms containing unpaired electrons with opposite spins is called s–s σ overlap.
e.g. Formation of H2 molecule by s–s σ overlap:
Hydrogen atom (Z = 1) has electronic configuration: 1s1.
The 1s1 orbitals of two hydrogen atoms overlap along the internuclear axis to form a σ bond between the atoms in the H2 molecule. - Diagram:
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