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Radical anion
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<p>In <a href="/facts/Organic_chemistry/djxhxaNg">organic chemistry</a>, a radical anion is a <a href="/facts/Radical_(chemistry)/qFymuVoT">free radical</a> species that carries a <a href="/facts/Charge_(chemistry)/wrbwhF3z">negative charge</a>. Radical <a href="/facts/Anion/wrbwhF3z">anions</a> are encountered in <a href="/facts/Organic_chemistry/djxhxaNg">organic chemistry</a> as reduced derivatives of polycyclic aromatic compounds, e.g. <a href="/facts/Sodium_naphthenide/0MLBfHCS">sodium naphthenide</a>. An example of a non-carbon radical anion is the <a href="/facts/Superoxide/2X2sQocn">superoxide</a> anion, formed by transfer of one electron to an <a href="/facts/Oxygen/acyn6o8r">oxygen</a> molecule. Radical anions are typically indicated by M ∙ − {\displaystyle M^{\bullet -}} . </p>