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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<u><em>In contour drawings, crossing lines is one way to indicate this. A line that is drawn to show the edge and surface ridges of an object. ... This type of line can denote instability and tension.</em></u>
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exactly what are you asking???
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