mendeleev table - period 6

astatine atom atomic background barium beaker bismuth blocks caesium chart chemical chemistry class color compare configuration different education electronegative electrons element frame full gas gold graphic groups hafnium illustration iridium isolated lab lanthanum lavoisier lead mass mendeleev mercury molecule nature nuclear number order osmium periodic periods physics platinum polonium radon research rhenium row school science scientific script shot signs symbols systematize table tantalum teach technique technology text thallium tungsten typescript valence vector weight