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<p>and can be either an atomic, molecular, ionic or radical species.</p>

<p><big> Classification </big></p>
<p>Generally, a chemical species is defined as a chemical identity that has the same set of molecular energy levels in a defined timescale (i.e. an <a href="page.php?w=experiment">experiment</a>). These energy levels determine the way the chemical species will interact with others through properties such as bonding or isotopic compositions. The chemical species can be an <a href="page.php?w=atom">atom</a>, <a href="page.php?w=molecule">molecule</a>,</p><p>
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