How will you find the valency of chlorine, sulphur and mag... - Science

Question

How will you find the valency of chlorine, sulphur and magnesium?

Answer

Valency is determined by the number of electrons in the outermost shell (valence electrons).

1. Magnesium:

Atomic number = 12
Electronic configuration = 2, 8, 2
Since it has 2 electrons in the outermost shell, Valency = 2.

2. Sulphur:

Atomic number = 16
Electronic configuration = 2, 8, 6
Since it has 6 electrons in the outermost shell (more than 4), it gains electrons.
Valency = 8 – 6 = 2.

3. Chlorine:

Atomic number = 17
Electronic configuration = 2, 8, 7
Since it has 7 electrons in the outermost shell (more than 4), it gains electrons.
Valency = 8 – 7 = 1.

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Chapter Info

Subject: Science
Class: class 9
Chapter 4: Structure of the Atom
Medium: English Medium