Which of these compounds did Berzelius isolate?
Sodium
Potassium
Selenium
Calcium
Answer
The compound isolated by Berzelius is selenium. It's a nonmetallic element that belongs to Group 16 (chalcogens) and Period 4 of the periodic table. It is a brittle, lustrous, grayish-red metalloid. It is an analog of sulfur and tellurium. Selenium has various allotropes with the stable hexagonal "metallic" selenium and red "amorphous" selenium being the most common.
The Berzelius Brain Teaser: Unraveling the Secrets of Jöns Jacob Berzelius!
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