Question

(1) State the method of determining the valency of an element if its atomic number is given.
(11) Determine the valency of the following elements, the atomic numbers of which are given in
parenthesis:
Chlorine (17), Sulphur (16), Aluminium (13)
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Answer 1

Answer:

1. The valency is calculated by finding the number of electrons required to get and octet in its valence shell.

2-i. Chlorine has a valency of 1, as Argon is an inert gas with atomic number 18.

2-ii. Sulfur has a valency of 6, as we can see in its molecular form (S6).

2-iii. Aluminum has a valency of 3 as the nearest inert gas id Neon, with atomic number 10.

Answer 2

Answer:

1.) we can find out vanlency by the help of valence electron

11.) chlorine :- 1 , sulphur :- 2 , aluminium :- 3

Explanation:

valence electron means the no of electon present in the outermost orbit