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manganese
[ mang-guh-nees, -neez ]
noun
- a hard, brittle, grayish-white, metallic element, an oxide of which, MnO 2 manganese dioxide, is a valuable oxidizing agent: used chiefly as an alloying agent in steel to give it toughness. : Mn; : 54.938; : 25; : 7.2 at 20°C.
manganese
/ ˈmæŋɡəˌniːz /
noun
- a brittle greyish-white metallic element that exists in four allotropic forms, occurring principally in pyrolusite and rhodonite: used in making steel and ferromagnetic alloys. Symbol: Mn; atomic no: 25; atomic wt: 54.93805; valency: 1, 2, 3, 4, 6, or 7; relative density: 7.21–7.44; melting pt: 1246±3°C; boiling pt: 2062°C
manganese
/ măng′gə-nēz′ /
- A grayish-white, hard, brittle metallic element that occurs in several different minerals and in nodules on the ocean floor. It is used to increase the hardness and strength of steel and other important alloys. Atomic number 25; atomic weight 54.9380; melting point 1,244°C; boiling point 1,962°C; specific gravity 7.21 to 7.44; valence 1, 2, 3, 4, 6, 7.
- See Periodic Table
Word History and Origins
Origin of manganese1
Word History and Origins
Origin of manganese1
Example Sentences
Iron is already commonly used in these kinds of reactions, but they combined it with manganese, which has been shown to boost the activity of iron catalysts, and potassium, which is known to encourage the formation of longer-chain hydrocarbons.
Scientists have discovered the first bacteria known to use the metal manganese to grow.
When bacteria do borrow electrons from manganese, they convert the metal to a dark material called manganese oxide.
Leadbetter knew that scientists had long suspected that bacteria could use manganese to fuel growth.
He wants to search there and other places for more examples of bacteria that use manganese for energy.
The fact that the Rio Grande rise also harbors traces of iron and manganese was not lost on the minerals industry.
And it put forward sensitive and intelligent antenn as it sought its food thirty miles away down the coast—manganese.
The moment they showed signs of coming his way, Edward Garden was after richer returns than manganese would yield.
When peroxide of manganese has been used, the manganese is also precipitated as oxide.
If the amount of manganese is more than double that of iron, the separation of the latter will take a much longer time.
When the amount of manganese is small, the separation of the two elements takes place very rapidly, and the results are accurate.
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