Examine the elements of the third period and classify them as metals or non-metals. Comment on the metallic and non-metallic character of the third period. Name the most metallic element and non-metallic element of this period.

Explanation

Na (Sodium), Mg (Magnesium) and Al (Aluminium) are metals. Si (Silicon) is a metalloid. P (Phosphorus), S (Sulphur) and Cl (Chlorine) are non-metals. 142 As we go from left to right across the third period, metallic character decreases and non-metallic character increases.
The most metallic element in the third period is Na and the most non-metallic element is Cl.