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通过对四种估算二元异原子共价键的离子性百分数的方法讨论，初步找到估算共价键的部分离子性的思路和方法．对以元素电负性的大小确认二元共价键的离子性百分数给予新的补充，对片面突出电负性差值（△ｘ）的作用而忽略键合原子周围环境因素的影响，求算共价键的部分离子性的思路和方法给予了纠正．
Through the discussion of the four methods to estimate the ionic percentage of covalent bond of binary heteroatoms, the idea and method of estimating the partial ionicity of covalent bond were preliminarily found out. A new supplement is made to confirm the ionic percentage of the binary covalent bond by the size of the electronegativity of the element, and neglects the effect of environmental factors around the bound atom by neglecting the effect of one-sided electronegativity difference (Δx) Part of the covalent bond ionic ideas and methods to be corrected.