Elements 109 words

a silvery ductile metallic element found primarily in bauxite

a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms

a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite

a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere

a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar

a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium

a soft silvery metallic element of the alkali earth group; found in barite

a radioactive transuranic element; discovered by bombarding americium with helium

a light strong brittle grey toxic bivalent metallic element

a heavy brittle diamagnetic trivalent metallic element (resembles arsenic and antimony chemically); usually recovered as a by-product from ores of other metals

a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder

a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water

a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores

a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal

a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals

a radioactive transuranic element; discovered by bombarding curium with alpha particles

an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds

a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group

a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water)

a hard brittle multivalent metallic element; resistant to corrosion and tarnishing

a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition

a former name for niobium

a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor

a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei

an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen)

a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic

a radioactive transuranic element produced by bombarding plutonium with neutrons

a trivalent metallic element of the rare earth group; occurs with yttrium

a bivalent and trivalent metallic element of the rare earth group

a radioactive transuranic metallic element produced by bombarding plutonium with neutrons

a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite

a radioactive element of the alkali-metal group discovered as a disintegration product of actinium

a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group

a rare silvery (usually trivalent) metallic element; brittle at low temperatures but liquid above room temperature; occurs in trace amounts in bauxite and zinc ores

a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite

a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia

a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons

a transuranic element

an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen)

a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)

a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds

a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe

a rare soft silvery metallic element; occurs in small quantities in sphalerite

a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)

a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium

a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood

a colorless element that is one of the six inert gasses; occurs in trace amounts in air

a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth

a radioactive transuranic element synthesized from californium

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a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals

a trivalent metallic element of the rare earth group; usually occurs in association with yttrium

a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine)

a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals

a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol)

a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures

a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel

a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium

a colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts

a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium

a hard malleable ductile silvery metallic element that is resistant to corrosion; used in alloys; occurs in pentlandite and smaltite and garnierite and millerite

a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium

a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues

a radioactive transuranic element synthesized by bombarding curium with carbon ions; 7 isotopes are known

a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known

a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust

a silver-white metallic element of the platinum group that resembles platinum; occurs in some copper and nickel ores; does not tarnish at ordinary temperatures and is used (alloyed with gold) in jewelry

a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms

a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits

a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239

a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor

a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite

a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process

a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium

a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

an intensely radioactive metallic element that occurs in minute amounts in uranium ores

a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health

a rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum

a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum

a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite

a rare polyvalent metallic element of the platinum group; it is found associated with platinum

a radioactive transuranic element which has been synthesized

a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite

a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite

a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite)

a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors

a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography

a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt)

a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite

an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)

a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite

a crystalline metallic element not found in nature; occurs as one of the fission products of uranium

a brittle silver-white metalloid element that is related to selenium and sulfur; it is used in alloys and as a semiconductor; occurs mainly as tellurides in ores of copper and nickel and silver and gold

a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite

a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores

a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands

a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime

a silvery malleable metallic element that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxide

a light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite

a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms

a heavy grey-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite

a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons

a soft silvery white toxic metallic element used in steel alloys; it occurs in several complex minerals including carnotite and vanadinite

a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts

a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime

a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys

a bluish-white lustrous metallic element; brittle at ordinary temperatures but malleable when heated; used in a wide variety of alloys and in galvanizing iron; it occurs naturally as zinc sulphide in zinc blende

a lustrous grey strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon