Select the correct answer. Which unit can be used to express the rate of a reaction? A ml/s
B. ml/g
C. g/mL
D. mL /mol
E. S/ mL

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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