一、共价键的键长缩短效应共价分子中的核间距离称之为键长,这是众所周知的。在教学中经常遇到有的相同原子的相同原子核间或有的相异原子核间距离,其实测值理论值(共价半径的加合值)有所缩短的现象,这种现象称之为键长缩短效应。例如,B-X键长缩短见表1。 First, the covalent bond length shortening effect Covalent molecular distance between the nucleus called the bond length, which is well known. In teaching often encountered some of the same atomic nuclei or the same distance between nuclei, or in fact the measured value of the theoretical value (covalent radius of the addend) shortened phenomenon, this phenomenon is called bond length Shorten the effect. For example, B-X bond length in Table 1.