For an atom of sulfur, which electron would require the least amount of energy to remove from the atom?

A. 3s2
B. 1s1
C. 3p1
D. 3p4

I think the answer is c or d, preferring d. What would you go with?

2 answers

S is 1s2 2s2 2p6 3s2 3p4. You are right with either c or d. I don't know what your study guide is calling 3p1 and 3p4.
The 3p configuration is ud u u where up is the spin one way and d is spin the other way. he least amount to ionize with be the two outside (either of the 3p unpaired electrons). I would think both 3p1 and 3p4 means the u and d of the first orbital but that may not be right.
it is 3p4 since a sulfur atom doesnt have 3p1