Question

which element is classified as a noble gas? answer: a helium (he) b nitrogen (n) c chlorine (cl) d francium (fr)

Explanation:

Noble gases are elements in Group 18 of the periodic table. They have a full valence shell of electrons, making them very stable and unreactive. Helium (\(He\)) is in Group 18. Nitrogen (\(N\)) is in Group 15, chlorine (\(Cl\)) is in Group 17, and francium (\(Fr\)) is in Group 1.

Answer:

A. helium (\(He\))