Question

Valency of elements ……… and then ……… as we move across the period while it  remains the same down the group.
Fill in the blanks​

Answer 1

Answer:

Valency of elements increase then decrease as we move across the period while it remains the same down the group.

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.