In the third period, which is the most metallic and most non-metallic element?
The elements of third period are:
Na, Mg, Al, Si, P, S, Cl, Ar
The most metallic element is sodium i.e., Na and the most non-metallic element is chlorine i.e., Cl.
In a period, metallic character decreases on moving from left to right because of decrease in size of atom due to which elements cannot lose electron easily.