List in order of increasing number of unpaired electrons: N,Na,Si,Cr,Ar.
A)Cr

Question

List in order of increasing number of unpaired electrons: N,Na,Si,Cr,Ar.
A)Cr < Si < Na < N < Ar
B)Ar < Cr < N < Na < Si
C)Ar < Cr < Si < Na < N
D)N < Na < Cr < Si < Ar
E)Ar < Na < Si < N < Cr

Quizplus · Accepted Answer

Ar has 0 unpaired electrons (noble gas configuration), Na has 1 (in its 3s orbital), Si has 2 (in its 3p orbital), N has 3 (in its 2p orbitals), and Cr, due to its unique electron configuration ([Ar] 3d^5 4s^1), has 6 unpaired electrons.

List in Order of Increasing Number of Unpaired Electrons: N,Na,Si,Cr,Ar