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<p><a href="page.php?w=oxygen">oxygen</a>, and <a href="page.php?w=fluorine">fluorine</a> as arranged in the <a href="page.php?w=periodic_table">periodic table</a> of the elements. The main group includes the elements (except <a href="page.php?w=hydrogen">hydrogen</a>, which is sometimes excluded) in groups 1 and 2 (<a href="page.php?w=s-block">s-block</a>), and groups 13 to 18 (<a href="page.php?w=p-block">p-block</a>). The s-block elements are primarily characterised by one main oxidation state, and the p-block elements, when they have multiple</p><p>
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