abundance of the chemical elements actinide concept actinides in the environment actinium alkali metal alkaline earth metal alternative periodic tables aluminium americium antimony argon arsenic astatine atomic number barium berkelium beryllium bismuth bohrium boron bromine cadmium caesium calcium californium carbon cerium chemical element chemical elements named after places chemical makeup of the human body chemical symbol chlorine chromium cobalt collective names of groups of like elements copper curium d-block darmstadtium dubnium dysprosium einsteinium erbium europium f-block fermium fluorine francium g-block gadolinium gallium germanium gold hafnium half-life halogen hassium helium holmium hydrogen indium iodine ion iridium iron krypton lanthanoid lanthanum lawrencium lead list of chemical element name etymologies list of chemical elements named after people list of elements list of elements by atomic number list of elements by atomic weight list of elements by boiling point list of elements by density list of elements by melting point list of elements by name list of elements by stability of isotopes list of elements by symbol list of oxidation states of the elements lithium lutetium magnesium manganese manhattan project meitnerium mendelevium metal metalloid molybdenum neodymium neon neptunium nickel niobium nitrogen nobelium noble gas nonmetal osmium oxygen p-block palladium periodic table periodic table block phosphorus platinum platinum group plutonium polonium post-transition metal potassium praseodymium promethium protactinium radioactive decay radium radon rare earth element rhenium rhodium roentgenium royal society of chemistry rubidium ruthenium rutherfordium s-block samarium scandium seaborgium selenium silicon silver sodium strontium sulfur tantalum technetium tellurium terbium thallium thorium thulium timeline of chemical elements discoveries tin titanium transition metal tungsten unbinilium ununbium ununennium ununhexium ununoctium ununpentium ununquadium ununseptium ununtrium uranium vanadium xenon ytterbium yttrium zinc zirconium