单词	alkali metal
释义	alkali metal noun : any of the monovalent mostly basic metals of group I of the periodic table comprising lithium, sodium, potassium, rubidium, cesium, and francium see Periodic Table Example Sentences Recent Examples on the Web In the paper, scientists characterize the meteorites’ material phases as alloys of lead, tin and indium, which is the softest non-alkali metal. Fox News, 24 Mar. 2020 The first group, known as the alkali metals, has just one such electron, easy to lose when reacting with an element that has more electrons, such as one from the 17th group, the halogens. Bill Andrews, Discover Magazine, 26 June 2019 The brine water that has been accumulating for millennia under the Atacama is lithium-rich, and companies pump it out and send the brine to evaporation ponds where heat extracts the water and leaves the reactive alkali metal behind. Megan Geuss, Ars Technica, 21 Oct. 2018 The calibration is done with the alkali metal cesium. Jay Bennett, Popular Mechanics, 24 Mar. 2017 Word History First Known Use 1860, in the meaning defined above Medical Definition alkali metal noun : any of the univalent mostly basic metals of group I of the periodic table comprising lithium, sodium, potassium, rubidium, cesium, and francium
随便看	undependable undependablenesses undependably undepressed undeprivable under under (a strain under (a/the) strain under (someone's) tutelage under (the) cover of darkness/night under a cloud of suspicion under a doctor's care under a microscope under a pseudonym under a spell under a/the microscope under an alias under appeal under arrest under assault under attack under bevel under budget under canvas under certain circumstances

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