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[" From "2" mg calcium,"1.2times10^(19)"...

[" From "2" mg calcium,"1.2times10^(19)" atoms are removed.The number of g-atoms of calcium left is "],[[" (A) "5times10^(-5)," (B) "2times10^(-5)," (C) "3times10^(-5)," (D) "5times10^(-6)]]

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