You can create brown from the primary colors red, yellow, and blue. Since red and yellow make orange, you can also make brown by mixing blue and orange. The RGB model used for creating color on screens like the television or a computer uses red and green to make brown.
Tetravalent
We have already seen an example of how a covalent bond can form between two hydrogen atoms producing molecular (H2) as opposed to the atomic form of hydrogen. ... As in all its compounds and its elemental forms, carbon is tetravalent, which means that it always forms four bonds.
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