<p><strong>Noun</strong></p><ul><li>A steel-gray, rare metallic element, belonging to the platinum group of metals.</li><li>Symbol: Ru</li><li>Atomic weight: 101.07</li><li>Atomic number: 44</li><li>Density: 12.2 at 20°C</li></ul><p><strong>End of Response</strong></p>