![]() ![]() Those earths, such as lime (calcium oxide), that resembled the alkalies (soda ash and potash) were designated alkaline earths. Prior to the 19th century, substances that were nonmetallic, insoluble in water, and unchanged by fire were known as earths. The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!Īlkaline-earth metal, any of the six chemical elements that comprise Group 2 (IIa) of the periodic table.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning. ![]()
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