Question

how many elements are gaseous at room temperature? where do the gaseous elements tend to be located on the table?

Explanation:

• For the first question, we refer to the periodic table and knowledge of element states at room temperature (approx. 20 - 25°C). Noble gases (He, Ne, Ar, Kr, Xe, Rn), hydrogen (H₂), nitrogen (N₂), oxygen (O₂), fluorine (F₂), and chlorine (Cl₂) are gaseous at room temperature.
• For the second question, we consider the general layout of the periodic table. Gaseous elements (excluding some noble gases which are in their own group - 18) like hydrogen (in group 1 in some tables, but often separately placed), nitrogen (group 15), oxygen (group 16), fluorine and chlorine (group 17) are located on the right - hand side of the periodic table. Noble gases (group 18) are also on the far right.

Answer:

• There are 11 elements (He, Ne, Ar, Kr, Xe, Rn, H₂, N₂, O₂, F₂, Cl₂) that are gaseous at room temperature.
• Gaseous elements tend to be located on the right - hand side of the periodic table.