Main features of valence bond theory of complexes
Answers
Answer:
Salient features of VBT: 1) A central metal ion provide number of vacant s,p & d orbital to ligands to form coordinate bond. 2) Number of vacant orbitals provided by central metal ion will equal to its coordination number. ... 4) Vacant orbitals undergo hybridisation to form same number of hybrid orbitals.
Answer:
Valence bond theory was developed by Heitler and London in 1927 and modified by Pauling and Slater in 1931.This theory is based on following postulates.
1:—To form a covalent bond, two atoms must come close to each other so that orbitals of one overlaps with the other .
2:—Orbitals having unpaired electrons of anti spin overlap with each other .
3:—After overlapping new localised bond orbital is formed which has maximum probability of finding electrons.
4:—Covalent bond is formed due to electrostatic attraction between radii and the accumulated electrons cloud and by attraction between spins of anti spin electrons .
5:—Greater the extent of overlap stronger will be the bond formed.
6:— The extent of overlapping depends upon nature of orbitals involved in overlapping and nature of overlapping.
7:— Sigma bond is formed due to axial overlap and Pi bond is formed due to lateral overlap.
8:—S orbitals are spherical, symmetrical and thus show only axial overlapping, on the other hand P orbitals are directionally concentrated and thus show either axial overlapping or lateral overlapping.
Explanation:
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