<p><strong>Noun:</strong></p><ul><li>a nonmetallic element chemically resembling sulfur and tellurium, occurring in several allotropic forms, as crystalline and amorphous, and having an electrical resistance that varies under the influence of light.</li><li>Symbol: Se</li><li>Atomic weight: 78.96</li><li>Atomic number: 34</li><li>Electrical resistance: (gray) 4.80 at 25°C, (red) 4.50 at 25°C</li></ul>