JAMB - Chemistry (2007 - No. 30)
The elements that belong to the third period of the periodic table are?
Li, Be, Al and P
Na, P, O and Cl
B, C, N and O
Na, Mg, S and Ar
הֶסבֵּר
Elements in period 3 have 3 shells in their atomic structure.
These include elements from sodium to argon.