)a reaction which forms a solid product is an example of a(n): a. oxidation-reduction reaction. b. combustion reaction. c. precipitation reaction. d. gas evolution reaction.

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

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.