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Calcium

/kˈælsiəm/
B2
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(noun) The chemical element with atomic number 20: a soft, silvery-white alkaline earth metal which occurs naturally as carbonate in limestone and as silicate in many rocks.

Calcium is absent from his diet.
Beryllium, magnesium, calcium, strontium, barium and radium are alkaline earth metals.
CEFR Practice Quiz
____ is an important mineral that helps keep your bones strong.

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