Metal in atomic clocks
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CESIUMMetal in atomic clocks
CESIUMElement in atomic clocks
CESIUMElement used in atomic clocks
chromiumThe chemical element of atomic number 24, a hard white metal used in stainless steel and other alloys
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
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
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
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
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
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
osmiuma very hard brittle bluish-white metal occurring with platinum and alloyed with iridium in osmiridium: used to produce platinum alloys, mainly for pen tips and instrument pivots, as a catalyst, and in electric-light filaments. Symbol: Os; atomic no: 76; atomic wt: 190.2; valency: 0 to 8; relative density: 22.57; melting pt: 3033±30°C; boiling pt: 5012±100°C