Convert 15.9mm to its equivalent measurement in km

0.0000159

Explanation:

Divide 15.9 by 1000000, because 1 kilometer equals 1000000 millimeters.

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.