The pair of elements that are nonmetals and gas at room temperature is Fluorine, F, and chlorine, Cl.
What are nonmetals?
Nonmetals are metallic, colorless, or colored and mostly are solid and gases.
They have low density, high electronegativity.
The nonmetal gases are neon, argon, fluorine, chlorine, etc.
Nonmetals are present on the right side of the periodic table.
Thus, the correct option is a,. Fluorine, F, and chlorine, Cl.
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