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<p>valence electrons in their outermost energy level, they can gain an electron by reacting with atoms of other elements to satisfy the <a href="page.php?w=octet_rule">octet rule</a>. <a href="page.php?w=Fluorine">Fluorine</a> is the most reactive of all elements; it is the only element more electronegative than oxygen, it attacks otherwise-inert materials such as glass, and it forms compounds with the usually inert <a href="page.php?w=noble_gas">noble gas</a>es. It is a <a href="page.php?w=Corrosive_substance">corrosive</a> and highly toxic gas.</p><p>
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