Question

Elements A,B and C have atomic numbers 9,13 and 17 respectively.
(a) Write their electronic distribution.
(b) Determine their valency.
(c) Classify them as metals and non -metals

Answer 1

Answer:

b) 1,3,1

Explanation:

c) non metal, metal, non metal

a) 2,7

2,8,3

2,8,7