Boron is trivalent in its compounds. Comment
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Explanation:
The electronic configuration of Boron is 1s² 2s² 2p¹. Its trivalency is explained by promoting the electrons from 2s to 2p orbitals so that number of unpaired electrons become three. Then, one 2s and two 2p orbitals are hybridised to form a set of three equivalent sp² hybrid orbitals which are triangular planar, with a bond angle of 120⁰.
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