Based on Avogadro's number, which of the following is NOT true? (For reference: the molecular mass of hydrogen is 1 g/mol, the molecular mass of oxygen is 16 g/mol.)

i believe the answer is a.

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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~ trueboss72