between the nuclei forming the bond. Valence s orbitals form sigma bonds, and if the z-axis is the internuclear axis, then valence pz orbitals also form sigma bonds. For a molecule like HF, a sigma-bonding MO results from the combination of the H 1s orbital and the F 2pz atomic orbital. For π bonds, the electron density lies above and below the internuclear axis. The π bonds are formed when px orbitals are combined (side-to-side overlap) and when py orbitals are combined. 11. We use d orbitals when we…
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