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Question

Explain the formation of BeCl2 molecules using hybridisation.
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Solution

Hybridisation is the process of intermixing the orbitals of slightly different energies to form a new set of orbitals of equivalent energies and shapes.
[0.5 Marks]
The ground state electronic configuration of Be is 1s2 2s2. In the excited state, one of the 2s-electrons is promoted to the vacant 2p orbital.
[0.5 Marks]
One 2s and one 2p-orbital get hybridised to form two sp hybridised orbitals. These two sp hybrid orbitals are oriented in opposite directions forming an angle of 180°.
[0.5 Marks]
Each of the sp hybridised orbital overlaps with the 3p-orbital of chlorine atoms axially and forms two Be-Cl sigma bonds.
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