question_answer 119)

      Atomic number of a 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.

Answer:

   

Atomic Number	Electronic configuration	Group number	Period number	Valency	Elements
10	2, 8	(8 + 10) = 18	2nd	Zero	Neon
20	2, 8, 8, 2	= 2	4th	2	Calcium
7	2, 5	(5 + 10) = 15	2nd	(8 - 5) = 3	Nitrogen
14	2, 8, 4	(4 + 10) = 14	3rd	4	Silicon