电价：在原子间形成离子键的过程中，由电子从一种元素的原子转移到另一种元素的原子所表示的价。
Electrovalence: valence characterized by the transfer of electrons from atoms of one element to atoms of another during the formation of an ionic bond between the atoms.
每一元素倾向于既满足它的主价又要满足它的副价。
Every element tends to satisfy both its primary and secondary valence.
基于元素键参数拓扑指数原理以及镧系元素价层电子结构特征构建了一种新的拓扑指数HLA。
An element bonding parameter topological index HLA is proposed based on topological principle and valence shell electron structural character.
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