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RADON |
Rare element |
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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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HOLMIUM |
A rare element said to be contained in gadolinite. |
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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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HELIUM |
A gaseous element found in the atmospheres of the sun and
earth and in some rare minerals. |
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WASIUM |
A rare element supposed by Bahr to have been extracted from
wasite, but now identified with thorium. |
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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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DECIPIUM |
A supposed rare element, said to be associated with
cerium, yttrium, etc., in the mineral samarskite, and more recently
called samarium. Symbol Dp. See Samarium. |
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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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GADOLINIA |
A rare earth, regarded by some as an oxide of the
supposed element gadolinium, by others as only a mixture of the oxides
of yttrium, erbium, ytterbium, etc. |
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YTTERBIUM |
A rare element of the boron group, sometimes associated
with yttrium or other related elements, as in euxenite and gadolinite.
Symbol Yb; provisional atomic weight 173.2. Cf. Yttrium. |
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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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MOLYBDENUM |
A rare element of the chromium group, occurring in
nature in the minerals molybdenite and wulfenite, and when reduced
obtained as a hard, silve... |
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COLUMBIUM |
A rare element of the vanadium group, first found in a
variety of the mineral columbite occurring in Connecticut, probably at
Haddam. Atomic we... |
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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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RHODIUM |
A rare element of the light platinum group. It is found in
platinum ores, and obtained free as a white inert metal which it is
very difficult t... |
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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, ... |