The elements that belong to the third period of the periodic table are?
A
Li, Be, Al and P
B
Na, P, O and Cl
C
B, C, N and O
D
Na, Mg, S and Ar
Verified Correct Answer: D.
Chemical Principles & Mechanism
Elements in period 3 have 3 shells in their atomic structure.
These include elements from sodium to argon.
Source: WAEC / JAMB / NECO Classroom Archive (Record #3856)