Question

What are the trend for metallic and non - metallic characters?

Answer 1

As we move from left to right in a period, electronegativity increases, $IE$ decreases, tendency to gain $e^{-}$ increases, thereby decreasing metallic character and increasing non-metallic character.

As we move down the group, size increases, electronegativity decreases, tendency to close $e^{-}$ increases, thereby increasing electropositive character, as a result, metallic character increases.