Periodic Classification of Elements (C10)

How does the metallic character of elements vary on moving from

  1. left to right in a period,
  2. from top to bottom in a group

of the Modern Periodic Table ? Give reason for your answer.

Answer

(i) Left to right metallic character decreases

Reason: Effective nuclear charge increases / tendency to loose electrons decrease / electro-positivity decreases

(ii) Top to bottom metallic character increases

Reason: Size of atom increase / tendency to loose electron increases