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Chemical species

  Hello!

Welcome to my blog. Today we will discuss about chemical species. lets start.

If one molecule is identical to another, we can say they are the same chemical species.

Ion:

It is an atom or group of atoms having a charge on it. The charge may be positive or negative. 
There are two types of ions:

      Cations:

An atom or group of atoms having positive charge on it is called cation. They are formed when atoms lose electron from their valance shells.
Examples: 

Ca2+  Ag+  Al3+   H3O+   NH4+   Hg2+2    Fe+2    Fe +3

       Anions:

An atom or group of atoms having negative charge on it is called anion. They are formed by gain or addition of electron to an atom.
Examples:

  • Cl–   OH–     I–    Cr2O7-2    O-2     SO4-2

Molecular Ion:

When a molecule loses or gain electron it forms a molecular ion.

Free Radical:

These are atoms or groups of atoms possessing odd number of unpaired electrons. It is represented by putting a dot over the symbol of an element.



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