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Calcium

Nghe phát âm
( Xem từ này trên từ điển Anh Việt)

Noun Chemistry, Biology .

a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions. Symbol: Ca; atomic weight: 40.08; atomic number: 20; specific gravity
1.55 at 20?C.

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