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单词 valence electron
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Having used two electrons in bonding to the terminal hydrogen atoms, each boron has onevalenceelectronremaining for additional bonding.
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In semiconductors, thevalenceelectronplasma frequency is usually in the deep ultraviolet, which is why they are reflective.
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Chemically, muonic helium, possessing an unpairedvalenceelectron, can bond with other atoms, and behaves more like a hydrogen atom than an inert helium atom.
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It is a paramagnetic compound and also highly reducing, both consequences of its lowvalenceelectroncount.
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Hydrogen has only one "valenceelectron" and can form only one bond with an atom that has an incomplete outer shell.
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In a transition metal, avalenceelectroncan also be in an inner shell.
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Strictly speaking, both lanthanum and lutetium have been labeled as group 3 elements, because they both have a singlevalenceelectronin the d shell.
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For example, sodium has one "valenceelectron" in its outermost shell, so in ionized form it is commonly found with one lost electron, as.
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For metals and semiconductors one has different rules involvingvalenceelectronconcentration.
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Chlorine has seven "valence electrons" and can form only one bond with an atom that donates a "valenceelectron" to complete chlorine's outer shell.
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Although hydrogen has only onevalenceelectron, it can form bonds with more than one atom in hypervalent bonds.
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Since these elements contain one more or one lessvalenceelectronthan carbon, they turn synthetic diamond into p-type or n-type semiconductor.
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Instead, avalenceelectronfor a transition metal is defined as an electron that resides outside a noble-gas core.
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Hydrogen, like the alkali metals, has onevalenceelectronand reacts easily with the halogens but the similarities end there.
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The electrons involved in the faradaic processes are transferred to or fromvalenceelectronstates (orbitals) of the redox electrode reagent.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.

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更新时间:2025/1/19 3:04:09