Sigma Bond
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State
A sigma bond forms from end-to-end orbital overlap along the axis connecting two bonded nuclei, and every single bond has exactly one.
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Two chlorine 3p orbitals overlap end to end along the internuclear axis, forming Cl2's single sigma bond.
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Sigma bonds aren't limited to s orbitals — Cl2's sigma bond is p–p overlap; end-to-end geometry, not orbital type, makes a bond sigma.