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Nitronium ion

Chemical compound
The nitronium ion, [NO₂]⁺, is a cation. It is an onium ion because its nitrogen atom has +1 charge, similar to ammonium ion [NH₄]⁺. It is created by the removal of an electron from the paramagnetic nitrogen dioxide molecule NO₂, or the protonation... Wikipedia
Formula: NO2+
3D model (JSmol): Interactive image
Molar mass: 46.005 g·mol−1
Std molar entropy (S⦵298): 233.86 J K−1 mol−1