GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Oxides. Oxides of various metals. Left to right, front row in watch glasses: manganese(IV) oxide (MnO2, black), zinc oxide (ZnO, white), vanadium(V) oxide (V2O5, orange); middle row: lead(II) oxide (PbO, red-yellow in watch glass), magnesium oxide (MgO, white), copper oxide(I) (Cu2O, red), calcium oxide (CaO, white); back row: iron(III) oxide (Fe2O3, red), copper(II) oxide (CuO, black), aluminium oxide (Al2O3, white).
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