The electronic configuration of an elements is 1s22s22p63s23p3. How many unpaired electrons are there in the element?
A
5
B
4
C
3
D
2
Verified Correct Answer: C.
Chemical Principles & Mechanism
The atomic number of phosphorus is 15 and the 3p sublevel has three unpaired electrons.
Source: WAEC / JAMB / NECO Classroom Archive (Record #12998)