Question

How do trend 1)atomic size 2)metallic character changes in a group going top to bottom ina modern periodic table

Answer 1

atomic size increases from top to bottom in groups and decreases from left to right in periods
metallic nature also increases from top to bottom in groups and decreases from left to right in periods

Answer 2

While going from top to bottom in a modern periodic table,

1. Atomic size increases as the number of shells increases as we move downwards.
2. Metallic character increases as number of shells increases and it becomes easier for the atom to lose electrons from the valence shell.