1.
The combining capacity of an atom or a radical determined by the number of electrons that it will lose, add, or share when it reacts with other atoms.
化合价，原子价原子或原子团与其它原子反映时由所失、增加成共享的电子数目决定的化合能力
2.
The number of atoms in a molecule.
原子数，原子价，化合价单质分子中的原子数
3.
The hydrocarbon radical, C6H13, having valence1.
己基碳氢化合物基，C6H13，原子价为1
4.
The silicon atom occupies the space opening(interstice)between the oxygen atoms and shares four valence electrons with the four oxygen atoms.
硅原子占据了氧原子之间的空隙并且和四个氧原子共用化合价。
5.
(chemistry) having a valence of three.
（化学）有三价原子的。
6.
(chemistry) haveing a valence of four.
（化学）有四价原子的。
7.
(chemistry) having a valence of five.
（化学）有五个原子价的。
8.
a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals.
氨中的氢原子被单价烃基替代后形成的化合物。
9.
(chemistry) having a valence of two or having two valences.
（化学）有二个原子价之一的，或有两个原子价的。
10.
A set of eight valence electrons in an atom or ion, forming a stable configuration.
八重态在一个原子或离子中，形成稳定组态的一组八个化合价电子
11.
" Ligand： Atom, group (see functional group), or molecule attached to a central atom, usually of a transition element, in a coordination or complex compound."
配位体:与一个中心原子相连的原子或分子，通常是过渡元素，形成共价键化合物或复合离子。
12.
Having a valence of5.
五价的有五个原子价的
13.
A hydrocarbon radical, C4H9, with the structure of butane and valence1.
丁基一种碳氢化合的基团，C4H9，具有丁烷的结构，原子价为
14.
A divalent atom or radical.
二价原子二价的原子或基
15.
This ten-dollar hat is now on sale for five.
帽子大减价，原价10 美元，现价5 美元。
16.
Peroxide: Any of a class of chemical compounds in which two oxygen atoms are linked by a single covalent Bond.
过氧化物: 任何由两个氧原子以单个共价键相互结合在一起的一类化合物。
17.
Spectrochemical order and valence shell electronic structure of coordination atoms;
光谱化学序列与配位原子的价层电子结构
18.
Having valence3.
三价的化合价为3的