Question

what are the better kal columns at the horizontal rows in the modern periodic table called how does the metallic character and the atomic radius vary on moving left to right in horizontal rows​

Answer 1

In the modern periodic table, there are 18 vertical columns known as Groups and 7 horizontal rows known as Periods. Metallic character increases on moving down a group in the Modern Periodic table. ... So, the valence electron can be easily lost by the element, thereby metallic character increases on moving down a group.

Answer 2

Veritcal columns are groups

Horizontal rows are periods

As we move from left to right the valence electrons goes on increasing and the distance between nucleus and the valence electron decreases so the the tendancy of loosing electron decreases it shows property of non metal.