(n) a heavy brittle diamagnetic trivalent metallic element (resembles arsenic and antimony chemically); usually recovered as a by-product from ores of other metals, Syn. Bi, atomic number 83
(n) a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey, Syn. atomic number 82, Pb, Example:the children were playing with lead soldiers
(n) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures, Syn. atomic number 80, quicksilver, hydrargyrum, Hg
(n) a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust, Syn. O, atomic number 8
(n) a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor, Syn. Po, atomic number 84
(n) a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health, Syn. Rn, atomic number 86
(n) a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores, Syn. atomic number 81, Tl
[钫 / 鈁, fāngㄈㄤ] francium Fr, unstable alkali metal 鹼性金屬|碱性金属 with atomic number 87, disintegration product of actinium 錒|锕, See Also: 鹼性金屬, 碱性金属, 錒, 锕#56032