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Dioxygenyl
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<p>The dioxygenyl <a href="/facts/Ion/3bePpDna">ion</a>, O+2, is a rarely-encountered <a href="/facts/Oxycation/8qITH3PY">oxycation</a> in which both <a href="/facts/Oxygen/acyn6o8r">oxygen atoms</a> have a formal <a href="/facts/Oxidation_state/W53W6s6V">oxidation state</a> of +1/2. It is formally derived from <a href="/facts/Oxygen/acyn6o8r">oxygen</a> by the removal of an <a href="/facts/Electron/L0KBo5cW">electron</a>: </p> O2 → O+2 + e− <p>The energy change for this process is called the <a href="/facts/Ionization_energy/lezUajfA">ionization energy</a> of the oxygen molecule. Relative to most molecules, this ionization energy is very high at 1175 kJ/mol. As a result, the scope of the chemistry of O+2 is quite limited, acting mainly as a 1-electron oxidiser. </p>