Atomic number of few elements are given below 10, 20, 7, 14
(a) Identify the elements
(b) Identify the group number of these elements in the periodic table
(c) Identify the periods of these elements in the periodic table
(d) What would be the electronic configuration for each of these elements
(e) Determine the valency of these elements.

Explanation

(a) The elements are : Neon (Z = 10), Calcium (Z = 20), Nitrogen (Z = 7) and Silicon (Z 14)
(b) Group numbers : Neon (18), Calcium (2), Nitrogen (15), Silicon (14).
(c) Periods : Neon (2), Calcium (4), Fluorine (2), Silicon (3).
(d) Electronic Configuration : Neon (2, 8) , Calcium (2, 8, 8, 2) Nitrogen (2, 5) , Silicon (2, 8, 4)
(e) Valency : Neon (zero) , Calcium (2) , Nitrogen (3) , Silicon (4)