Question

What is the trend of variation of valency in a period and group in modern periodic table?
​

Answer 1

Explanation:

In a period, the number of valence electrons increases (mostly for light metal/elements) as we move from left to right side. However, in a group this periodic trend is constant, that is the number of valence electrons remains the same.

I HOPE IT WILL HELP YOU

MARK ME BRAILIEST

Answer 2

Answer:

In a period, the number of valence electrons increase (mostly for light metals/elements )as we move from left to right side. However, in a group this periodic trend is constantly, that is the number of valence electrons remains the same.