Valence electrons related to the stability and reactivity of an element

Dear student,
The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms.
Some atoms can be stable with an octet even though their valence shell such as inert gases. 
Some atoms which are short of an octet configuration by one or two electrons can lose or gain electrons to achieve stable configuration such atoms are more reactive when compared to the other atoms.


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