Describe Valence Bond theory of H2 molecule with the help of forces of attraction,
repulsions and potential energy curve
b. Describe the geometry of (i) SF4 and (ii) ClF3(iii)BF3 with the help of VSEPR theory
Answers
Explanation:
atoms combine so that their energy decreases and stability increases. Consider hydrogen atoms A and B are approaching each other. When the two atoms are at large distance from each other, there is no interaction between them. As these two atoms each. other new attractive and repulsive forces being to operate. These are:
∙ Attractive force between nucleus of H
A
and electrons of H
A
∙ Attractive force between nucleus of H
B
and electrons of H
A
∙ Repulsive force between nuclei of both the atoms
∙ Repulsive force between electrons of both the atoms.
Experimentally. it has been found that the magnitude of new attractive force is more than new repulsive force. As a result, two atoms approach each other and potential energy decrease. Ultimately a stage is reached where the net force of attraction balanced the force of repulsion and system acquires minimum energy. At this stage, two hydrogen atoms are said to be bonded together to from a stable molecule having the bond length of 74 pm. At this stage, the minimum distance between the two nuclie which is necessary for minimum energy and maximum stability is called bond length and the energy released in gaseous state by combination of two isolated atoms to form a molecule is called bounded energy.....
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