Which atom does not have an unpaired electron in its ground state electron configuration?
A)C
B)Ca
C)P
D)Cl

Question

Quizplus · Accepted Answer

Ca has a ground state electron configuration of [Ar] 4s2, meaning that both of its valence electrons are paired, making it the only option with no unpaired electrons. C has an unpaired electron in its 2p orbital, P has three unpaired electrons in its 3p orbital, and Cl has one unpaired electron in its 3p orbital.

Which Atom Does Not Have an Unpaired Electron in Its