Valency of an Ion


 
 
Concept Explanation
 

Valency of an Ion

Valency of an Ion: Valence electrons are the electrons contained in the outermost or valence shell of an atom or ion. The valency of an ion is defined as the number of units of positive or negative charges present on the ion.

For example, the valencies of Na^{+},Ca^{2+}and:SO_{4}^{2-}  ions  are 1,  2 and 2 respectively.

Ion with postive charge are known as cations. Eg: Na^+,Ca^2^+,Al^3^+etc. The valency in these ions are 1,2,3 respectively.

Ions with negative charge are known as anions. Eg: Cl^-,SO_4^2^-, etc. Here, valences are 1 and 2 respectively.

Sample Questions
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Question : 1

Which of the following are correct :

(a) The valency of an ion is defined as the number of units of positive or negative charges present on the ion.

(b) The valencies of Na^{+},Ca^{2+}and:SO_{4}^{2-}  ions  are 2,  2 and 3 respectively.

Right Option : A
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Explanation
Question : 2

Which of the following are correct :

(a) Na+ is a cation.

(b) Cl- is a cation.

(c) O2- is a anion.

(d) He is a cation.

Right Option : D
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Explanation
Question : 3

What is the valency of Ca2+ ?

Right Option : B
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Explanation
 
 


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