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Question
Identify the type of overlap present in F2. Explain diagrammatically.
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Solution
p–p σ overlap:
- This type of overlap takes place when two p orbitals from different atoms overlap along the internuclear axis.
e.g. Formation of F2 molecule by p–p σ overlap:
Fluorine atom (Z = 9) has electronic configuration 1s2 2s2 \[\ce{2p^2_{{x}}}\] \[\ce{2p^2_{{y}}}\] \[\ce{2p^1_{{z}}}\]
During the formation of F2 molecule, the half-filled 2pz orbital of one F atom overlaps with a similar half-filled 2pz orbital containing electron with the opposite spin of another F atom axially, and a p–p σ overlap is formed. - Diagram:
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