Which atomic model was proposed by the scientist who performed an experiment using gold foil and alpha particles? which statement best explains why mercury is considered an element? a. it is a metal that is a poor conductor of heat. b. it is a metal that is naturally a liquid at room temperature. c. it is a poison that is easily absorbed through unbroken skin. d. it is a substance that cannot be chemically broken down any further.

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answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.