Difference between molecule and molecular ion.

In this tutorial you will find out the brief difference between molecule and molecular ion. The basic difference between these two is same as the difference between atom and an ion. To understand the concept regarding this topic you must need to pass through the definitions of molecule and molecular ion.


Molecule is the smallest substance which can exist independently.


Molecule is always neutral i.e the valancy of each atom is satisfied. If we take example of CH4 (Methane gas), the valancy of carbon and hydrogen is fully satisfied, simply we can say its stable.

Molecular Ion:

Any Molecule having charge on it is called molecular ion.


As molecular ion is always cationic (+ve) or anionic (-ve), that’s why they are not neutral and always tends to react with any electronically deficient or efficient specie.

Consider CH3(+) having positive charge on its top, which means valancy of carbon is not fully satisfied and tends to accept electron to be neutral.

Difference between molecule and molecular ion:

By scaning above text, you can find out the basic difference between molecule and molecular ion. Any specie which can exist independently around us having stable composition is termed as molecule and if molecule is accidently damaged by any incident e.g. photochemical reaction, it can break out and form molecular ion.


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Fawad's Chemistry

Hope you fine. I'm Fawad and author of this blog "Chemanalogy". Love to write on Chemistry. Currently teaching A Levels, O Levels and University Chemistry offline as well as online. Connect to chemanalogy community by subscribing via email.