A novel link index X proposed deals with the feature of molecule graph, the property of vertical atom and the bonding of atoms connected to each other. Matrices are used to represent these characters.
新的键指数X考虑了分子的图形特征，顶点原子的性质，顶点原子与相邻原子的键合情况，并以矩阵的形式把这些特征表达出来。
Valence Number of bonds (see bonding) an atom can form.
元素的一个原子能够结合其它原子的数目。
Valence Number of bonds (see bonding) an atom can form.
元素的一个原子能够结合其它原子的数目。
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