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- illustration of chemistry, The periodic table of the elements, Nickel, Copper, Zine and Gallium atom, properties of the chemical elements exhibit a periodic dependence on their atomic numbers Mouse Pad #663101960
illustration of chemistry, The periodic table of the elements, Nickel, Copper, Zine and Gallium atom, properties of the chemical elements exhibit a periodic dependence on their atomic numbers Mouse Pad #663101960