Indicate the number of unpaired electrons in : (a) P, (b) Si, (c) Cr, (d) Fe and (e) Kr.





Q.66:- Indicate the number of unpaired electrons in : (a) P, (b) Si, (c) Cr, (d) Fe and (e) Kr.

 

 

Answer:-
(a) 15P = 1s2s2p3s3 pxpypz1. 3 unpaired electrons. (in 3p)
(b) 14Si = 1s2s2p3s3 pxpy1. 2 unpaired electrons.(in 3p)
(c) 24Cr = 1s2s2p3s3p3d4s1. 6 unpaired electrons. (5 in 3d and 1 in 4s)
(d)  26Fe = 1s2s2p3s3p3d4s2. 4 unpaired electrons. (in 3d)
(e) 36Kr = It is a Noble gas. All orbitals are filled. No unpaired electrons.