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Chemical species

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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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