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sorry pic wont work
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i can help if you get the pic to work
I think the answer is it represent the shape of orbitals that electrons can occupy within an atom.
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not sure if this is the right way to answer this question but PbS is Phosphate-buffered saline (i think)
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Hydrogenation – meaning, to treat with hydrogen – is a chemical reaction between molecular hydrogen and another compound or element, usually in the presence of a catalyst such as nickel, palladium or platinum. The process is commonly employed to reduce or saturate organic compounds
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