Which pair of properties describes the elements in group 18

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The question is incomplete; the complete question is;

Which pair of properties describes the elements in Group 18?

They are chemically stable and liquid at room temperature.

They have eight valence electrons and are flammable.

They are magnetic and boil at low temperatures.

They are gaseous at room temperature and chemically stable.

They are gaseous at room temperature and chemically stable.

Explanation:

The group 18 elements are generally called the noble gases or the inert gases. This is because they are mostly monoatomic gases with a high degree of chemical stability.

Recall that group 18 elements already have eight electrons in their outermost shell so they are very stable as a result of a complete octet. They do not easily participate in chemical reactions because of their chemical inertness.

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.

it's all four options.