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<p>and Z is the number of <a href="page.php?w=formula_unit">formula unit</a>s per <a href="page.php?w=unit_cell">unit cell</a>. Density was not measured directly but calculated from the lattice parameters.</p>

<p><big>Oxides</big></p>
<p><a href="page.php?w=Actinium_oxide">Actinium oxide</a> (Ac<sub>2</sub>O<sub>3</sub>) can be obtained by heating the hydroxide at 500 °C or the <a href="page.php?w=oxalate">oxalate</a> at 1100 °C, in vacuum. Its crystal lattice is <a href="page.php?w=Isomorphism_%28crystallography%29">isotypic</a> with the oxides of most</p><p>
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