Question

what are the main postulates of VSEPR theory....


answer my previous questions for 50 points!​

Answer 1

~ The shape of any molecule can be explained by the repulsion between all the electron pairs that are present in the valence shell.
~ The repulsion between two lone pairs is greater than the repulsion between a lone pair and a bond pair.Presence of a lone pair on the central atom causes slight distortion of the bond angles from their ideal values.
~ The electronegativity difference between the central atom and the other atoms determines the magnitude of repulsion between the bonding pair of electrons.
~ Triple bonds cause more repulsion than the double bonds. Similarly double bond causes more repulsion than a single bond.

Answer 2

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• The shape of a molecule depends upon the number of valence shell electron pairs (bonded or non-bonded) around the central atom.

• Pairs of electrons in the valence shell repel one another since their electron clouds are negatively charged.

• These pairs of electrons tend to occupy such positions in space that minimise repulsion and thus maximise distance between them.

• The valence shell is taken as a sphere with the electron pairs localising on the spherical surface at maximum distance from one another.

• A multiple bond is treated as if it is a single electron pair and the two or three electron pairs of a multiple bond are treated as a single super pair.

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