Periodic Table — Periodic Properties & Variation of Properties — Question 25

Metallic/Non-Metallic character depends on atomic size and nuclear charge. Increase in atomic size increases the Metallic nature and increase in nuclear charge decreases the metallic nature. On moving down the group both atomic size and nuclear charge increases. But the atomic size increase dominates over nuclear charge increase. Hence, tendency to lose electrons increases. Thus, metallic character increases as one moves down a group and non-metallic character decreases.