<p><strong>Noun:</strong></p><ul><li>A soft, malleable, rare, bluish-white metallic element used in the manufacture of alloys.</li><li>In the form of its salts, it is used in rodenticides.</li><li>Symbol: Tl</li><li>Atomic Weight: 204.37</li><li>Atomic Number: 81</li><li>Density: 11.85 at 20°C</li></ul>