Which element is a noble gas?
(1 point)
Responses
radon (Rn)
radon (Rn)
rubidium (Rb)
rubidium (Rb)
hydrogen (H)
hydrogen (H)
fluorine (F)
None of the listed elements are noble gases. The correct answer is radon (Rn).
Which statement about nitrogen (N) and phosphorus (P) is correct?
(1 point)
Responses
They have the same number of valence electrons.
They have the same number of valence electrons.
They are both inert.
They are both inert.
They are both classified as halogens.
They are both classified as halogens.
They have the same number of electron shells.