The toy car in the picture is propelled forward by a) the weight of the car. b) the force of the car on the air. c) the friction of the wheels on the car. d) the reaction force of the air on the car.

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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