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Selenium
Selenium Se*le"ni*um, n. [NL., from Gr. ??? the moon. So
called because of its chemical analogy to tellurium (from L.
tellus the earth), being, as it were, a companion to it.]
(Chem.)
A nonmetallic element of the sulphur group, and analogous to
sulphur in its compounds. It is found in small quantities
with sulphur and some sulphur ores, and obtained in the free
state as a dark reddish powder or crystalline mass, or as a
dark metallic-looking substance. It exhibits under the action
of light a remarkable variation in electric conductivity, and
is used in certain electric apparatus. Symbol Se. Atomic
weight 78.9.
Meaning of Selenium from wikipedia
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Selenium is a
chemical element; it has the
symbol Se and
atomic number 34. It is a
nonmetal (more
rarely considered a metalloid) with
properties that are...
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Selenium is an open
source umbrella project for a
range of
tools and
libraries aimed at
supporting browser automation. It
provides a
playback tool for...
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Selenium disulfide, also
known as
selenium sulfide, is a
chemical compound and
medication used to
treat seborrheic dermatitis, dandruff, and pityriasis...
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Selenium sulfide can
refer to
either of the following:
Selenium disulfide, SeS2
Selenium hexasulfide, Se2S6 This set
index article lists chemical compounds...
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Selenium is an
essential micronutrient for animals,
though it is
toxic in
large doses. In plants, it
sometimes occurs in
toxic amounts as forage, e.g....
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Selenium deficiency occurs when an
organism lacks the
required levels of
selenium, a
critical nutrient in many species. Deficiency,
although relatively...
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Selenium chloride may
refer to the
following chemical compounds:
Selenium monochloride, Se2Cl2
Selenium dichloride, SeCl2
Selenium tetrachloride, SeCl4...
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notable for
diverse content of micronutrients,
especially a high
amount of
selenium. The wood of the
Brazil nut tree is
prized for its
quality in carpentry...
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Selenium dioxide is the
chemical compound with the
formula SeO2. This
colorless solid is one of the most
frequently encountered compounds of
selenium...
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Selenium oxydichloride is the
inorganic compound with the
formula SeOCl2. It is a
colorless liquid. With a high
dielectric constant (55) and high specific...