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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 + 2 xx 8 = 23)` molecule. In the valence shell, N has seven electrons and hence it is less stable. To become more stable by having even (8) number of electrons in the valence shell, it undergoes dimerisation to form `N_(2)O_(4)`
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