covalency

The ordering of the magnitude for bond covalency is La-O

共价性的大小次序为La-O

So you can see that polar covalency is a tendency towards ionic bonding.

所以你看得出极性共价就是，趋向离子键的。

Investigation of Covalency and Spectrum Shifts in 3 d Transition-metal Compounds

3d过渡晶体化学键共价性和光谱位移研究

It is found that Li ions have more space to move, and its covalency is very strong.

分析发现，Li离子在晶胞内有更大活动空间，共价性很强。

The relationship between bond valence and bond covalency has been investigated by a semiempirical method.

用一种半经验方法研究了固体材料中键电荷与键共价性的关系.

And why did he call it polar covalency?

为什么要称它为极性共价呢？

The results of calculation show that the bonds between lanthanum and coordination atoms have certain extent covalency.

结果表明，镧与配位原子间的键具有一定程度的共价性。