Question

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Answer 1

Answer:

Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium.

Answer 2

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Calcium is a chemical element with the symbol Ca and atomic number 20.

As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air.