2. Bonds become weaker as we move down the Periodic Table. Compare CO and CS, or the carbon–halogen bonds CF, CCl, CBr, CI. This is a consequence of the first generalization, since bond distances must increase as we go down the periodic table because the number of inner electrons increases. However, it is noted that ‘‘high-level ab initio molecular-orbital calculations confirm that the effect of alkyl substituents on RX bond dissociation energies varies according to the nature of X (the stabilizing
2. Bonds become weaker as we move down the Periodic Table. Compare CO and CS, or the carbon–halogen bonds CF, CCl, CBr, CI. This is a consequence of the first generalization, since bond distances must increase as we go down the periodic table because the number of inner electrons increases. However, it is noted that ‘‘high-level ab initio molecular-orbital calculations confirm that the effect of alkyl substituents on RX bond dissociation energies varies according to the nature of X (the stabilizing
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