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Use "valencies" in a sentence
"The arrangement of the elements, or of groups of elements in the order of their atomic weights, corresponds to their so-called valencies, as well as, to some extent, to their distinctive chemical properties; as is apparent among other series in that of Li, Be, Ba, C,"
"Their ability to get to the root of a chord or ground a question about volts and valencies is a huge source of happiness to me."
"What is more, the charges that needed to be attributed to ions to explain electrolysis were themselves linked to the valencies of the chemists."