Select the correct answer. Which statement best describes how chemical equations demonstrate conservation of mass? O A. The number of reactants is the same as the number of products. O B. The compounds are the same on each side of the reaction. O c. The number of atoms of each element is the same on each side of the equation. OD. The state of matter is the same on each side of the equation. Note:
No need to explain.

Option C )The number of atoms of each element is the same on each side of the equation.

Option D

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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.

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