Question

Write The Features Of Valence Bond Theory

Answer 1

Answer:

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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.

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Answer 2

Answer:

1. Covalent bonds are formed when two valence orbitals (half-filled) belonging to two different atoms overlap on each other. The electron density in the area between the two bonding atoms increases as a result of this overlapping, thereby increasing the stability of the resulting molecule.
2. The presence of many unpaired electrons in the valence shell of an atom enables it to form multiple bonds with other atoms. The paired electrons present in the valence shell do not take participate in the formation of chemical bonds as per the valence bond theory.
3. Covalent chemical bonds are directional and are also parallel to the region corresponding to the atomic orbitals that are overlapping.
4. Sigma bonds and pi bonds differ in the pattern that the atomic orbitals overlap in, i.e. pi bonds are formed from sidewise overlapping whereas the overlapping along the axis containing the nuclei of the two atoms leads to the formation of sigma bonds.

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