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Selenium
Selenium
Structure of hexagonal (gray) selenium
Structure of hexagonal (gray) selenium
Selenium is named after the Selene, the Greek Goddess of the Moon
Selenium is named after the Selene, the Greek Goddess of the Moon
Native selenium in sandstone, from a uranium mine near Grants, New Mexico
Native selenium in sandstone, from a uranium mine near Grants, New Mexico
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Dalton's symbols for the more common elements, as of 1806, and the relative weights he calculated. The symbols for magnesium and calcium ("lime") were
Dalton's symbols for the more common elements, as of 1806, and the relative weights he calculated. The symbols for magnesium and calcium ("lime") were replaced by 1808, and that for gold was simplified.