Question

which element is classified as a noble gas?
o
n
cl
xe

Explanation:

Noble gases are in Group 18 of the periodic table, with full valence electron shells. Oxygen (O) is in Group 16, Nitrogen (N) in Group 15, Chlorine (Cl) in Group 17. Xenon (Xe) is in Group 18, so it's a noble gas.

Answer:

D. Xe