Question

what property do all of the group 18 elements have that makes them stand out from other elements?

• they are the only nonmetals that are liquid at room temperature.
• they are the only nonmetals that are solid at room temperature.
• they are very likely to bond with any element, whether it is metallic or not.
• they are very unlikely to bond with any element, whether it is metallic or not.

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Explanation:

Group 18 elements (noble gases) have a full valence electron shell, making them chemically inert. So they are very unlikely to bond with other elements. The first option is incorrect (bromine/mercury are liquid nonmetals/metals, not noble gases). The second is incorrect (noble gases are gaseous or solid at low temp, not typical solid nonmetals at room temp). The third is wrong as they don't bond easily. The fourth matches their inert nature.

Answer:

D. They are very unlikely to bond with any element, whether it is metallic or not.