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TANTALUM |
Rare metallic element |
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YTTRIUM |
Rare metallic element |
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RHENIUM |
Rare metallic element |
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SAMARIUM |
A rare metallic element of doubtful identity. |
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NORWEGIUM |
A rare metallic element, of doubtful identification,
said to occur in the copper-nickel of Norway. |
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PHILIPPIUM |
A rare and doubtful metallic element said to have been
discovered in the mineral samarskite. |
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THULIUM |
A rare metallic element of uncertain properties and
identity, said to have been found in the mineral gadolinite. |
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DAVYUM |
A rare metallic element found in platinum ore. It is a
white malleable substance. Symbol Da. Atomic weight 154. |
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GADOLINIUM |
A supposed rare metallic element, with a characteristic
spectrum, found associated with yttrium and other rare metals. Its
individuality and properties have not yet been determined. |
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TERBIUM |
A rare metallic element, of uncertain identification,
supposed to exist in certain minerals, as gadolinite and samarskite,
with other rare ytterbium earth. Symbol Tr or Tb. Atomic weight 150. |
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GALLIUM |
A rare metallic element, found in certain zinc ores. It is
white, hard, and malleable, resembling aluminium, and remarcable for
its low melting... |
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VESBIUM |
A rare metallic element of which little is known. It is
said by Scacchi to have been extracted from a yellowish incrustation
from the cracks of a Vesuvian lava erupted in 1631. |
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ZIRCONIUM |
A rare element of the carbon-silicon group, intermediate
between the metals and nonmetals, obtained from the mineral zircon as a
dark sooty pow... |
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ERBIUM |
A rare metallic element associated with several other rare
elements in the mineral gadolinite from Ytterby in Sweden. Symbol Er.
Atomic weight ... |
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RUBIDIUM |
A rare metallic element. It occurs quite widely, but in
small quantities, and always combined. It is isolated as a soft
yellowish white metal, ... |
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CERIUM |
A rare metallic element, occurring in the minerals cerite,
allanite, monazite, etc. Symbol Ce. Atomic weight 141.5. It resembles
iron in color ... |
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THORIUM |
A metallic element found in certain rare minerals, as
thorite, pyrochlore, monazite, etc., and isolated as an infusible gray
metallic powder wh... |
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DIDYMIUM |
A rare metallic substance usually associated with the
metal cerium; -- hence its name. It was formerly supposed to be an
element, but has since... |
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TELLURIUM |
A rare nonmetallic element, analogous to sulphur and
selenium, occasionally found native as a substance of a silver-white
metallic luster, but ... |
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VANADIUM |
A rare element of the nitrogen-phosphorus group, found
combined, in vanadates, in certain minerals, and reduced as an
infusible, grayish-white ... |
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IRIDIUM |
A rare metallic element, of the same group as platinum,
which it much resembles, being silver-white, but harder, and brittle,
and indifferent t... |
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SCANDIUM |
A rare metallic element of the boron group, whose
existence was predicted under the provisional name ekaboron by means of
the periodic law, and... |
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OSMIUM |
A rare metallic element of the platinum group, found native
as an alloy in platinum ore, and in iridosmine. It is a hard,
infusible, bluish or ... |
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THALLIUM |
A rare metallic element of the aluminium group found in
some minerals, as certain pyrites, and also in the lead-chamber deposit
in the manufact... |
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INDIUM |
A rare metallic element, discovered in certain ores of
zinc, by means of its characteristic spectrum of two indigo blue lines;
hence, its name.... |