acid actinium actinoid alexander litvinenko alexander litvinenko poisoning alkali alkali metal alkaline earth metal alloy alpha-particle spectroscopy alpha decay alpha particle aluminium americium antimony argon arsenic astatine atomic mass atomic mass unit atomic nucleus atomic number atomic radius bbc news barium becquerel berkelium beryllium beta decay biological half-life bismuth bohrium boiling point boron bromine cas registry number cadmium caesium calcium californium cancer carbon celsius cerium chelation therapy chemical element chemical elements data references chlorine chromium cobalt coefficient of thermal expansion collective names of groups of like elements collocation color copper crystal structure curie curium cyclotron darmstadtium day decay energy decay product density diffraction digital object identifier dimercaprol dubnium dysprosium einsteinium electron electron configuration electron diffraction electron shell electronegativity energy level england enthalpy of fusion erbium europium excited state fahrenheit fermium fluorine francium gadolinium gallium gamma ray gamma spectroscopy gaussian broadening general electric germanium glovebox gold hafnium half-life halide halogen hamlet hassium helium holmium hydrogen hydrogen cyanide indium iodine iridium iron isotope isotopes of polonium israel kelvin krypton lanthanoid lanthanum lawrencium lead leukemia list of elements by atomic number list of elements by name list of elements by symbol lithium liver lutetium magnesium mail order manganese marie curie meitnerium melting point mendelevium metal metalloid methylcobalamin microgram molybdenum moon natural abundance neodymium neon neptunium neutron neutron source nickel niobium nitrogen nobelium noble gas nonmetal nuclear weapon ore osmium oxidation state oxygen p-block palladium partitions of poland periodic table periodic table block phosphate phosphorus picometre pierre curie platinum plutonium poland polonius potassium praseodymium promethium protactinium proton radioisotope thermoelectric generator radium radon resistivity rhenium rhodium roentgenium rubidium ruthenium rutherfordium samarium scandium seaborgium selenium sheffield sievert silicon silver sky news sodium solid solubility spacecraft spallation specific heat capacity spleen strontium sulfur synthetic radioisotope tantalum technetium tellurium terbium textile thallium the age thermal conductivity thorium thulium tin titanium transition metal tritium tungsten unbinilium ununbium ununennium ununhexium ununoctium ununpentium ununquadium ununseptium ununtrium uraninite uranium vanadium vapor pressure wikimedia commons wiktionary xenon year ytterbium yttrium zinc zirconium