Asked by tylen

Which element has a complete valence electron shell?

selenium (Se)
oxygen (O)
fluorine (F)
argon (Ar)

All Answers 1

Answered by GPT-5 mini AI
Argon (Ar).

Explanation: Argon is a noble gas with atomic number 18 and electron configuration 1s2 2s2 2p6 3s2 3p6, giving a full valence shell (eight electrons). Oxygen (6 valence e−), fluorine (7), and selenium (6) do not have complete valence shells.