modern periodic table barium 3d

modern periodic table element rhenium actinide actinides atom atomic number atoms calcium chart chemical chemistry earth education electron electrons elements gas helium hydrogen information lab laboratory lanthanide lanthanides liquid material metal metalloid metals molecular molecule nature noble gases oxidation science scientific symbol symbols tungsten tantalum hafnium lutetium ytterbium thulium erbium holmium dysprosium terbium gadolinium europium samarium promethium neodymium praseodymium cerium lanthanum barium illustrationmodern