Selenium

Selenium is a chemical element of the periodic table that occurs naturally in solid form. Selenium is also an essential micronutrient for animals. However, caution is advised regarding selenium ingestion, since it is toxic in large doses.¹ If more than 400 milligrams of selenium are ingested in a day, selenosis may result. The symptoms of selenosis include hair loss, fatigue, garlic scent on breath, diarrhea and neurological damage.²

Fast Facts

1. A trace element¹
2. Toxic in at high amounts¹

Properties

• Chemical symbol: Se
• Atomic number: 34³
• Chemical series: Non-metal³
• Appearance: Metallic gray-black
• Atomic mass: 78.96(3)  g·mol−1³
• Phase: Solid
• Melting point: 221 °C³
• Boiling point: 685 °C
• Crystal structure: Hexagonal
• Atomic Radius: 115  pm
• Covalent Radius: 116  pm
• Van der Waals Radius: 190 pm

Disclaimer

The content on this page is not a substitute for professional medical advice. Please consult a doctor for information on selenium.

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