What MUST always be true of the masses of the red and blue liquids? А.
They will NEVER equal the mass of the purple liquid to the right of the arrow.
B.
They will ALWAYS equal the mass of the purple liquid to the right of the arrow.

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