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:

Explanation:

Element A - Electron distribution - K - 2, L - 7, M - 0, N - 0. 2,7

                    Valency - 1+

                    Metals/ Non-Metals - Non - Metal

                    Element - Fluorine

Element B - Electron distribution - K - 2, L - 8, M - 3, N - 0. 2,8,3

                    Valency - 3-

                    Metals / Non-Metals - Metal

                    Element - Aluminum

Element C - Electron distribution - K - 2, L - 8, M - 7, N - 0. 2,8,7

                    Valency - 1+

                    Metals / Non-Metals - Non Metal

                    Element - Chlorine