Question

The elements of the 3rd period of the periodic table are given along: Na Mg Al Si P S Cl

(a) Which is more non-metallic S or Cl?

Na Mg Al Si P S Cl

(b) Which has a higher atomic mass: Al or Cl?

Answer 1

(a) Along the group non-metallic character increases so; Cl (Chlorine) is more non-metallic.

(b) As we see the trend as the atomic no. increases atomic mass also increases (other than few exceptions). So, Cl has a higher atomic mass than Al.