Question

elements belonging to the same group have the same valency write scientific reason ​

Answer 1

Valency depends on the number of electrons present. As the elements that belongs to the same group has same number of electrons, their valency is equal.

  HAVE A WONDERFUL LIFE!!

Answer 2

*Answer:-

*The valency of an element is determined by the number of valence electron present in the outer shell of an atom. Since all the elements of a group have the same number of Valence Electrons.Therefore, they have same valency.

*For example,alkali metals have one valence electron. Hence, their valency is one.