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The second postulate of VSEPR (Valence Shell Electron Pair Repulsion) theory states that the electron pairs present in the valence shell of the central atom arrange themselves in such a way that the repulsions between them are minimum. Thus, electron pairs occupy positions as far apart from one another as possible. The extent of repulsion depends upon the nature of the electron pairs. A lone pair occupies more space around the central atom than a bonding pair because it is attracted by only one nucleus. Therefore, the order of repulsions is: Lone ______ _______ ____ ___ ___ ______ _________ ________ ______.
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