| 单词 | electron |
| 释义 | electron (once / 2528 pages) n If you take chemistry, you will learn about electrons. Electrons are the smallest of the particles that make up an atom, and they carry a negative charge. The number of protons and electrons is equal in each atom. The hydrogen atom, for example, has just one electron and one proton. The uranium atom, on the other hand, has 92 protons, and therefore, 92 electrons. The atom's atomic number is the number of protons in the atom, which by default is also the number of electrons. An electron is so small that it cannot be seen with the naked eye, but neither can the atom itself. WORD FAMILYelectron: antielectron, electrons+/antielectron: antielectrons USAGE EXAMPLESAtomic clocks use ultraviolet signals emitted in the change of electron energy levels to tell the time. BBC(Dec 30, 2016) Nonetheless, Sesame, a type of machine called an electron synchrotron, is about to open for business. Economist(Dec 20, 2016) When particles of light from the sun hit a panel’s cells, electrons are knocked free from their atoms, leaving a hole. Salon(Dec 17, 2016) n an elementary particle with negative charge Syn|Hypo|Hyper negatron delta ray an electron ejected from matter by ionizing radiation free electronelectron that is not attached to an atom or ion or molecule but is free to move under the influence of an electric field photoelectronan electron that is emitted from an atom or molecule by an incident photon valence electronan electron in the outer shell of an atom which can combine with other atoms to form molecules lepton an elementary particle that participates in weak interactions; has a baryon number of 0 |
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