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Problem: Calcium's atomic number is 20. It forms ions with 18 electrons. What is the electrical charge of a calcium ion?

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We are being asked to determine the charge of a calcium ion with 18 electrons (atomic number of Calcium is 20).  


An element or ion’s chemical formula is denoted as follows:



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Calcium's atomic number is 20. It forms ions with 18 electrons. What is the electrical charge of a calcium ion?

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