Element in atomic clocks
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CESIUMElement in atomic clocks
CESIUMElement used in atomic clocks
CESIUMMetal in atomic clocks
ISOTOPEElement resembling another in atomic structure.
lawrenciuma transuranic element, atomic no. 103, discovered in 1961
ISOTOPEElement resembling another in atomic number but not weight.
lawrenciumsLAWRENCIUM, a transuranic element, atomic no. 103, discovered in 1961
uraniumswhite, radioactive metallic element, important in the development of atomic energy
uraniumwhite, radioactive metallic element, important in the development of atomic energy
hassiuma synthetic element produced in small quantities by high-energy ion bombardment. Symbol: Hs; atomic no: 108
chromiumThe chemical element of atomic number 24, a hard white metal used in stainless steel and other alloys
transuranicdenoting any chemical element having atomic number beyond uranium (92), not occuring in nature but artificially produced by bombardment of atoms
molybdenumThe chemical element of atomic number 42, a brittle silver-gray metal of the transition series, used in some alloy steels
technetiumThe chemical element of atomic number 43, a radioactive metal. Technetium was the first element to be created artificially, in 1937, by bombarding molybdenum with deuterons
protactiniumThe chemical element of atomic number 91, a radioactive metal of the actinide series, occurring in small amounts as a product of the natural decay of uranium
thalliumThe chemical element of atomic number 81, a soft silvery-white metal that occurs naturally in small amounts in pyrite and other ores. Its compounds are very poisonous
germaniumThe chemical element of atomic number 32, a shiny gray semimetal. Germanium was important in the making of transistors and other semiconductor devices, but has been largely replaced by silicon
mendeleviumThe chemical element of atomic number 101, a radioactive metal of the actinide series. It does not occur naturally and was first made in 1955 by bombarding einsteinium with helium ions
einsteiniumThe chemical element of atomic number 99, a radioactive metal of the actinide series. Einsteinium does not occur naturally and was discovered in 1953 in debris from the first hydrogen bomb explosion
neptuniumThe chemical element of atomic number 93, a radioactive metal of the actinide series. Neptunium was discovered as a product of the bombardment of uranium with neutrons, and occurs only in trace amounts in nature
promethiumThe chemical element of atomic number 61, a radioactive metal of the lanthanide series. It was first produced artificially in a nuclear reactor and occurs in nature in traces as a product of uranium fission
neodymiumThe chemical element of atomic number 60, a silvery-white metal of the lanthanide series. Neodymium is a component of misch metal and some other alloys, and its compounds are used in coloring glass and ceramics
telluriumThe chemical element of atomic number 52, a brittle, shiny, silvery-white semimetal resembling selenium and occurring mainly in small amounts in metallic sulfide ores. It is a semiconductor and is used in some electrical devices and in specialized alloys
indiuma rare soft silvery metallic element associated with zinc ores: used in alloys, electronics, and electroplating. Symbol: In; atomic no: 49; atomic wt: 114.82; valency: 1, 2, or 3; relative density: 7.31; melting pt: 156.63°C; boiling pt: 2073°C
superheavyRelating to or denoting an element with an atomic mass or atomic number greater than those of the naturally occurring elements, esp. one belonging to a group above atomic number 110 having proton/neutron ratios that in theory confer relatively long half-lives
phosphorusThe chemical element of atomic number 15, a poisonous, combustible nonmetal that exists in two common allotropic forms, white phosphorus, a yellowish waxy solid that ignites spontaneously in air and glows in the dark, and red phosphorus, a less reactive form used in making matches
ceriuma malleable ductile steel-grey element of the lanthanide series of metals, used in lighter flints and as a reducing agent in metallurgy. Symbol: Ce; atomic no: 58; atomic wt: 140.115; valency: 3 or 4; relative density: 6.770; melting pt: 798°C; boiling pt: 3443°C
thuliuma malleable ductile silvery-grey element occurring principally in monazite. The radioisotope thulium-170 is used as an electron source in portable X-ray units. Symbol: Tm; atomic no: 69; atomic wt: 168.93421; valency: 3; relative density: 9.321; melting pt: 1545°C; boiling pt: 1950°C
plutoniumThe chemical element of atomic number 94, a dense silvery radioactive metal of the actinide series, used as a fuel in nuclear reactors and as an explosive in nuclear fission weapons. Plutonium only occurs in trace amounts in nature but is manufactured in nuclear reactors from uranium-238