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State Why the Valency of Sodium, Magnesium and Aluminium Is: +1, +2 and +3 Respectively. - Chemistry

Short Note

‘Valency is also the number of electrons – donated or accepted by an atom so as to achieve the stable electronic configuration of the nearest noble gas’. With reference to this definition –
State why the valency of sodium, magnesium and aluminium is: +1, +2 & +3 respectively.

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Solution

Valency is the number of electrons donated or lost from the valence shell. Since sodium donates 1 valence electron its valency is +1.
Magnesium loses 2 electrons and aluminium loses 3 electrons from their valence shell their valency is
+2 – magnesium
+3 – Aluminium

Concept: The Combining Capacity of Elements
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APPEARS IN

Viraf J. Dalal Class 8 New Simplified Middle School Chemistry
Chapter 4 Atomic Structure
Exercise | Q 13.2
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