An element X belongs to group 1 and 3 period. a. Give its electronic configuration b. Formula when it combines with oxygen c. State its nature
i. Since element A belongs to group 1, it has 1 valence electron in its atom. ii. The valency of group 1 elements is 1. So the valency of element A is 1. iii. The first element of third period is sodium. So the element A is sodium (Na).
