man·ga·nese /ˈmæŋgəˌniz, ˌnis/
錳[金屬元素]
man·ga·nese /ˈmæŋgəˌnɪz, ˌnɪs/ 名詞
錳
Man·ga·nese n. Chem. An element obtained by reduction of its oxide, as a hard, grayish white metal, fusible with difficulty (melting point 1244° C), but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc. Symbol Mn. Atomic number 25; Atomic weight 54.938 [C=12.011].
Note: ☞ An alloy of manganese with iron (called ferromanganese) is used to increase the density and hardness of steel.
Black oxide of manganese, Manganese dioxide or Manganese peroxide, or Black manganese Chem., a heavy black powder MnO2, occurring native as the mineral pyrolusite, and valuable as a strong oxidizer; -- called also familiarly manganese. It colors glass violet, and is used as a decolorizer to remove the green tint of impure glass.
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manganese
n : a hard brittle gray polyvalent metallic element that
resembles iron but is not magnetic; used in making steel;
occurs in many minerals [syn: Mn, atomic number 25]
manganese
Symbol: Mn
Atomic number: 25
Atomic weight: 54.938
Grey brittle metallic transition element. Rather electropositive, combines
with some non-metals when heated. Discovered in 1774 by Scheele.