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metallic element. for other uses, see calcium (disambiguation) . chemical element with atomic number chemical element with atomic number calcium, ca calcium appearance dull gray, silver; with a pale yellow tint [ ] standard atomic weight ar, std(ca) ( ) [ ] calcium in the periodic table hydrogen helium lithium
and electrical insulators, and in the manufacture of soaps. on the other hand, the metal in pure form has few applications due to its high reactivity; still, in small quantities it is often used as an alloying component in steelmaking, and sometimes, as a calcium–lead alloy, in making automotive batteries...
https://en.wikipedia.org/wiki/Calcium