Atomic weight5/18/2023 ![]() These examples are programmatically compiled from various online sources to illustrate current usage of the word 'atomic weight.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Jennifer Leman, Popular Mechanics, 3 Nov. 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. 2020 This approach succeeds most of the time, when the issue is, say, the atomic weight of hydrogen. Theresa Machemer, Smithsonian Magazine, 22 Jan. 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. 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. Bill Andrews, Discover Magazine, 26 June 2019 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. Bill Andrews, Discover Magazine, 26 June 2019 Specific trends, such as melting point and atomic radius, recur periodically among the elements when they’re listed in order of increasing atomic weight. ![]() ![]() A later starring role for radium would be as the source of alpha particles - helium nuclei - used by Rutherford in 1909 at the Cavendish laboratory in Cambridge to fire at a thin gold foil. 2010 Many periodic tables include the atomic number (number of protons) and atomic weight (which depends on protons and neutrons). The standard atomic weight of argon and lead have changed to an interval to reflect that the natural variation in isotopic composition exceeds the measurement. With atomic number 88, it has four natural isotopes of atomic weight 228, 226, 224 and 223 - though there are a remarkable 21 more artificial isotopes. Andrew Moseman, Discover Magazine, 18 Dec. Recent Examples on the Web The second is the atomic weight. ![]()
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