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Radium
Radium
Radium-226 radiation source. Activity 3300 Bq (3.3 kBq)
Radium-226 radiation source. Activity 3300 Bq (3.3 kBq)
Marie and Pierre Curie experimenting with radium, a drawing by André Castaigne
Marie and Pierre Curie experimenting with radium, a drawing by André Castaigne
Glass tube of radium chloride kept by the US Bureau of Standards that served as the primary standard of radioactivity for the United States in 1927.
Glass tube of radium chloride kept by the US Bureau of Standards that served as the primary standard of radioactivity for the United States in 1927.
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Estimated distribution of dark matter and dark energy in the universe. Only the fraction of the mass and energy in the universe labeled "atoms" is com
Estimated distribution of dark matter and dark energy in the universe. Only the fraction of the mass and energy in the universe labeled "atoms" is composed of chemical elements.
Portrait of Robert Boyle, c. 1740
Portrait of Robert Boyle, c. 1740
Title page of The Sceptical Chymist, published in 1661
Title page of The Sceptical Chymist, published in 1661
Portrait of Isaac Watts by John Shury, c. 1830
Portrait of Isaac Watts by John Shury, c. 1830