Formation of Ions


 
 
Concept Explanation
 

Formation of Ions

Formation of ions : Ions are formed by  the loss or gain of electrons. When an atom loss electrons, it becomes positively charged. Fro example, sodium(Na^+) and calcium(Ca^2^+)  can lose one and two electrons respectively from their outermost shells to have an octet and become sodium ion and calcium ion respectively.

 Na:::rightarrow :: Na^+:::+:::e

sodium        sodium ion    

Ca::::rightarrow::: Ca^2^+::;+:;:e

calcium         calcium ion

On the other hand, chlorine and oxygen can gain one and two electrons respectively in their outermost shells to have an octet, and they  become negatively charged ions.

    Cl::;+;;; e:;;rightarrow::: Cl^-

chlorine                        chloride  ion

  O:;;+:;;2e;;;rightarrow::; O^2^-

oxygen                         oxgen ion

Thus, ions are electrically charged atoms. The ions positive charge are called cation or positive ions.  The ions with negative charge are known as anion or negative ions.

Sample Questions
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Question : 1

________________ are the negatively charged ions.

Right Option : A
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Question : 2

In the formula of aluminium sulhpate, what does the subscript 3 indicate?

Right Option : D
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Question : 3

Which of the following is the ion of calcium?

Right Option : C
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