Question

what will be the group number of element A having three electrons in its outermost shell??​

Answer 1

Answer:

Explanation:If three shells → element belongs to third period.  If three valence electrons → element belongs to 13 group.Read more on Sarthaks.com - https://www.sarthaks.com/287560/state-the-group-period-the-element-having-three-shells-with-three-electrons-valence-shell

Answer 2

Electronic configuration of the element with 3 shells and 3 valence electrons is 2,8,3.

Electronic configuration of the element with 3 shells and 3 valence electrons is 2,8,3.So, they have 3rd orbit as valence shell and they have 3 electrons in the valence shell, so they belong to 3rd group.