background of 3d cubes of the s of the periodic table, tellurium, actinium, hydrogen and erbium forming the word teacher.

actinides actinium alkali atom atomic background chart chemical chemistry color cubes earth education element elements engineering erbium forming gas graphic group halogen hydrogen illustration information inorganic laboratory lanthanide malleable material mendeleev metal metalloid noble nonmetal number oxygen period periodic physics school science scientific substance symbol table teacher technology tellurium transition vector word