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Why does NO(2) dimerise ?...

Why does `NO_(2)` dimerise ?

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`NO_(2)` is an odd electron `(7+2xx8=23)` molecule. In the valence shell, N has seven electrons and hence is less stabele. To becomes more stable by acquiring inert gas configuration having 8 electrons in the valence shell, it undergoes dimerization to form `N_(2)O_(4)`.
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