Concept:A sigma (\( \sigma \)) bond is formed by the direct, head-to-head (axial) overlap of atomic orbitals.
Formula:$$ \text{Electron density is concentrated along the internuclear axis.} $$
Solution:- Because the overlap occurs exactly between the two nuclei, the resulting electron density is symmetrically distributed around the internuclear axis.
- This direct overlap produces the strongest type of covalent bond, called a Sigma bond.
Why other options are incorrect:- Option B & Option D: These represent entirely different bonding paradigms (intermolecular and metallic sea of electrons, respectively).
- Option C: In a pi-bond, the probability of finding electrons is maximum above and below the internuclear axis (sideways overlap), not directly on the line joining the nuclei.
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