SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Calcium nuggets on a watch glass. Calcium (Ca) is an alkaline earth metal element from group 2 of the periodic table. Calcium is a shiny, silvery-white metal that tarnishes on exposure to the air. In elemental form, it is a soft reactive metal that burns with a bright orange-red flame when heated in air. In ionic form, it is vital for cellular function.
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