A d-shell containing four unpaired electrons can exchange:

 # A d-shell containing four unpaired electrons can exchange:

A. four electrons 

B. three electrons

C. sixteen electrons 

D. six electrons

The correct answer is D. Six electrons.

Explanation:

A d-shell contains 5 orbitals in which 2 electrons can be accommodated for a maximum of 10 electrons.

When four of them are unpaired, the first unpaired electron can exchange with either of other three, making possible exchanges three, the second unpaired electron can then exchange with either of third and fourth (possible exchange with first already counted) and lastly the third unpaired electron can exchange with the fourth one, making a total of 3+2+1= 6 electron exchanges possible.

Now, Can you answer this one?

# A f-shell containing six unpaired electrons can exchange:

A. Three electrons 

B. Nine electrons

C. Twelve electrons 

D. Fifteen electrons

COMMENT YOUR ANSWER.