| 单词 | neutron |
| 释义 | neutron (once / 9002 pages) n The nucleus of an atom includes a proton, which has a positive charge, an electron, which has a negative charge, and neutron, which has no charge, or is "neutral." The hydrogen atom is the only atom without a neutron. The basis for the word neutron is both "neutral" and the suffix "-on," which probably comes from the Greek ión, "to go." The word ion first appeared in English in 1834, and neutron appeared in 1921, to represent the neutral part of an atom. Don't let the "neutral" part fool you, though — a neutron bomb, while "smaller" than other nuclear weapons, is still capable of mass destruction, as it emits more radiation, causing a wider sweep of damage to life. WORD FAMILYneutron: antineutron, neutrons USAGE EXAMPLESPulsars—spinning neutron stars—emit incredibly regular pulses of radio waves. Science Magazine(Dec 22, 2016) The spacecraft studies chemical elements by counting the gamma-rays and neutrons reflecting off Ceres as cosmic rays bombard it. Nature(Dec 14, 2016) Light from a lonely neutron star 400 light-years away is polarized, just like light reflecting off a pond, a team of astronomers reports. Science Magazine(Nov 30, 2016) n an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus Hyper nucleon a constituent (proton or neutron) of an atomic nucleus |
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