单词	atomic weight
释义	atomic weight noun : the mass of one atom of an element specifically : the average mass of an atom of an element as it occurs in nature that is expressed in atomic mass units see Chemical Elements Table Example Sentences Recent Examples on the Web Lead, with its heavy atomic weight, interferes with all of this as it gets swapped in for blood cells, neurons, and other crucial bits of biology. Michael J. Coren, Quartz, 16 June 2022 Plain ol’ carbon — carbon that has 6 protons and 6 neutrons for an atomic weight of 12 — is far more stable than radiocarbon, and therefore vastly more plentiful in Earth’s atmosphere. Rebecca Coffey, Forbes, 3 Mar. 2021 Kaiser and his colleagues chose rhenium because each atom is relatively large, compared more familiar atoms like carbon and oxygen that are less than one tenth of its atomic weight. Theresa Machemer, Smithsonian Magazine, 22 Jan. 2020 This approach succeeds most of the time, when the issue is, say, the atomic weight of hydrogen. Adrian Bardon, Scientific American, 26 June 2020 The atomic weight of the sun is composed of 92.1 percent hydrogen and 7.8 percent helium, with traces of carbon and nitrogen. Jennifer Leman, Popular Mechanics, 3 Nov. 2019 How to Read the Table Many periodic tables include the atomic number (number of protons) and atomic weight (which depends on protons and neutrons). Bill Andrews, Discover Magazine, 26 June 2019 So Bormanis came up with his own fictional heavy element, dysonium (named in honor of physicist Freeman Dyson), something with an atomic weight in the 130-135 range—well above the transuranic elements in the period table. Jennifer Ouellette, Ars Technica, 29 Dec. 2018 See More Word History First Known Use 1819, in the meaning defined above Medical Definition atomic weight noun : the mass of one atom of an element specifically : the average mass of an atom of an element as it occurs in nature that is expressed in atomic mass units see Chemical Elements Table
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