How many elements are gaseous at room temperature

There are 11 elements which are gaseous at room temperature.

Explanation:

In a period table, out of total number of elements discovered till date, only 11 naturally occur as gaseous state.

The elements that occur naturally in gaseous state are: Hydrogen (H), Helium (He), Nitrogen (N), Oxygen (O), Fluorine (F), Neon(Ne), Chlorine (Cl), Argon(Ar), Krypton(Kr), Xenon (Xe) and Radon(Rn).

Hence, there are 11 elements which are gaseous at room temperature.

answer; i believe that the correct answer is (a) potassium(k)

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.