Question

the atomic number of an element is 17 , identify. (1) identify the element and its symbol (2) number of valence electrons in its atom. (3) valency (4) group number (5) formula of its compound with hydrogen (6) formula of its molecule in gaseous form....
please answer the question...​

Answer 1

Answer:

CHLORINE SYMBOL-CL 2 NO OF VALENCE ELECTRONS IN CHLORINE IS 7. 3 GROUP NO IS 7 5- CLH

Answer 2

Answer:

1) Chlorine - Cl

2) 7 valence electrons

Electronic configuration of chlorine:-

K L M

2 8 7

So, last shell has 7 electrons.

3) Valency is 1

4) Chlorine belongs to group number 17.

5) HCl ( Both have valency of 1 )

6) Chlorine exists as diatomic molecule in atmosphere. Formula is Cl2.

Hope this helps you.