Word · Frequency #29315
valences
化合价；原子价
valences is the plural of valence.
chemistry: the combining power of an atom or radical, expressed by the number of hydrogen atoms (or equivalent) it can combine with
化学用语
- 1.
The combining capacity of an atom, functional group, or radical determined by the number of atoms of hydrogen with which it will unite, or the number of electrons that it will gain, lose, or share when it combines with other atoms, etc.
原子、官能团或基团的化合能力,由它能结合的氢原子数或与其他原子结合时获得、失去或共享的电子数决定。
- 2.
The number of binding sites of a molecule, such as an antibody or antigen.
分子(如抗体或抗原)的结合位点数目。
- 3.
The number of arguments that a verb can have, including its subject, ranging from zero to three or, less commonly, four.
动词能够具有的论元数量,包括主语,范围从零到三,或较少见的四。
- 4.
The value which a person places on something.
某人赋予某物的价值。
- 5.
For a correspondence T on a curve: a number k such that the divisors T(P)+kP are all linearly equivalent.
曲线上的对应T:一个数k,使得因子T(P)+kP都线性等价。
效价；结合价；原子、官能团或基团的化合能力,由它能结合的氢原子数或与其他原子结合时获得、失去或共享的电子数决定。；分子(如抗体或抗原)的结合位点数目。；动词能够具有的论元数量,包括主语,范围从零到三,或较少见的四。；某人赋予某物的价值。
In use
Carbon has a valence of four, so it can form many different compounds.
In this molecule, the valence of each atom determines how many bonds it can make.
Students in chemistry class learned that oxygen usually has a valence of two.
the valence of [element]
The valence of carbon is four.
碳的化合价是四。
have a valence of [number]
该词在化学中指“化合价”，在生物学中则指与抗原等结合的结合效价。
Oxygen has a valence of two.
氧具有二价。
Common mistakes
Oxygen has valence of two.Oxygen has a valence of two.
Connections
Collocations
- valence electron
- 价电子
- The number of valence electrons determines how an atom reacts.价电子的数量决定了原子如何反应。
- valence shell
- 价电子壳层
- Elements in the same group have the same number of electrons in their valence shell.同一族的元素具有相同数量的价电子壳层电子。
- valence bond
- 价键
- The valence bond theory explains how atoms form molecules by overlapping atomic orbitals.价键理论通过原子轨道重叠解释原子如何形成分子。
- valence band
- 价带
- Electrons in the valence band are tightly bound to the atom.价带中的电子与原子结合得很紧密。
- valence state
- 价态
- Iron can have valence states of +2 or +3 in its compounds.铁在其化合物中可呈现+2或+3的价态。
Synonyms
Learner notes
Memory Tip
val- 开头像 value（数值），记住原子的“价值”就是它的化合价，决定能结合几个原子。
Context & Register
语域：formal 常见场景：chemistry textbooks and journals、biology/immunology literature 该词为专业术语，通常用于化学或生物学的学术语境，多出现在教材、论文等书面材料中；日常口语中较少使用。
Pronunciation & Spelling
真正与 valence (/ˈveɪləns/) 押韵的是 surveillance (/sərˈveɪləns/)，两者重读音节后的 /veɪləns/ 相同。拼写相近的 -lence 词如 silence (/ˈsaɪləns/)、violence (/ˈvaɪələns/)、excellence (/ˈɛksələns/)、prevalence (/ˈprɛvələns/) 重读元音不同，不押韵；evidence (/ˈɛvɪdəns/) 以 -ence 结尾但读音为 /əns/。
Learn the forms together
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.