Question

The atomic number of three elements A, B and C are 11,17 and 6 respectively. Find

the valency of A, B and C.​

Answer 1

Answer:

(i) ● The electronic configuration of element A is: 2,8,1. Number of valence electrons=1 So, it belongs to 1st group. ● electronic configuration of element B is:2,8,4. It contains 4 valence electrons, so it belongs to 14th group. ● electronic configuration of element C is: 2,8,7. It contains 7 valence electrons, so it belongs to 17th group. (ii) The element B is Si and it has a valency of 4. The element C is Chlorine and it has a valency of 1. So the formula of compound when B reacts with C is SiCl4.Read more on Sarthaks.com - https://www.sarthaks.com/950932/the-atomic-number-of-three-elements-a-b-and-c-are-11-14-and-17-respectively