Radon is the heaviest naturally radioactive gas. a) noble b) halogen c) group 1 d) diatomic

A) noble

Explanation:

Noble gases are group 18 elements which have completely filled valence shell. thus they do not lose or gain electrons and are called as nonreactive or noble.

Electron configuration of radon is:

Halogens are group 17 elements and have a valency of 1 as they can gain one electron to attain stable configuration.

Group 1 elements are alkali metals which have a valency of 1 as they can lose their outermost electron to attain stable configuration.

Diatomic means the molecule contains two atoms in one molecule.

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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.