1Chemistry Two electrons occupying the same orbital in an atom or molecule.
〔化〕电子对（在一个原子或分子中占用同一轨道的两个电子）
Example sentencesExamples
In the case of aldehydes and ketones containing carbonyl groups, the highly nucleophilic Grignard reagent contributes its electron pair to form a bond with the carbon atom.
The resultant bond is called a double bond, and it is symbolized by two lines connecting the atoms, where each line corresponds to an electron pair.
Bonds are still the result of electron pairs residing in bonding molecular orbitals.
Although in each molecule there are three hydrogen atoms bonded to the central nitrogen atom, the nitrogen atom also carries a lone electron pair.
The halide retains the electron pair of the carbon-halogen bond when it leaves.
2Physics An electron and a positron produced in a high-energy reaction.
〔物理〕电子对（高能粒子反应中产生的一个电子和一个正电子）
Example sentencesExamples
Pairs of single nanotubes might be used in future experiments to separate the entangled electron pairs in superconductors.
Normal current is carried by single electrons; within superconductors the charge units are electron pairs called Cooper pairs.
Similarly, four protons are pumped into the intramembrane space as each electron pair flows through complexes III and as four electrons are used to reduce O 2 to H 2 O in complex IV.
This is primarily because of stabilization of the polarization of the radical cation-hydrated electron pair in the condensed media.
Such entangled particles should arise from splitting isolated electron pairs, but this effect hasn't been clearly observed yet, in part because the structures are hard to make.
Definition of electron pair in US English:
electron pair
noun
1Chemistry Two electrons occupying the same orbital in an atom or molecule.
〔化〕电子对（在一个原子或分子中占用同一轨道的两个电子）
Example sentencesExamples
The resultant bond is called a double bond, and it is symbolized by two lines connecting the atoms, where each line corresponds to an electron pair.
Bonds are still the result of electron pairs residing in bonding molecular orbitals.
In the case of aldehydes and ketones containing carbonyl groups, the highly nucleophilic Grignard reagent contributes its electron pair to form a bond with the carbon atom.
The halide retains the electron pair of the carbon-halogen bond when it leaves.
Although in each molecule there are three hydrogen atoms bonded to the central nitrogen atom, the nitrogen atom also carries a lone electron pair.
2Physics An electron and a positron produced in a high-energy reaction.
〔物理〕电子对（高能粒子反应中产生的一个电子和一个正电子）
Example sentencesExamples
Normal current is carried by single electrons; within superconductors the charge units are electron pairs called Cooper pairs.
This is primarily because of stabilization of the polarization of the radical cation-hydrated electron pair in the condensed media.
Pairs of single nanotubes might be used in future experiments to separate the entangled electron pairs in superconductors.
Such entangled particles should arise from splitting isolated electron pairs, but this effect hasn't been clearly observed yet, in part because the structures are hard to make.
Similarly, four protons are pumped into the intramembrane space as each electron pair flows through complexes III and as four electrons are used to reduce O 2 to H 2 O in complex IV.