| 单词 | periodic table |
| 释义 | > as lemmasperiodic table periodic table n. Chemistry a table of the elements arranged according to the periodic law; spec. one in which they are arranged in order of atomic number, usually in rows, such that groups of elements possessing analogous electronic structures, and hence exhibiting similar chemical properties, form vertical columns (groups) of the table. ΘΚΠ the world > matter > chemistry > elements and compounds > periodicity > [noun] law of octaves1865 periodic law1872 periodic system1875 period1879 periodicity1879 periodic classification1881 periodic table1890 1890 Science 21 Feb. 126/2 The horizontal series in the periodic table to which the element belongs. 1930 Engineering 21 Mar. 372/2 The sequence of the elements in the old periodic table with its eight groups and seven periods. 1990 Sciences Jan. 4/3 When the elements are merely indexed by atomic weight, a list results, but when that list is arranged so that similar elements appear in vertical columns..the list becomes the periodic table. < as lemmas |
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