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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Problem Details

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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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Subatomic Particles concept. You can view video lessons to learn Subatomic Particles. Or if you need more Subatomic Particles practice, you can also practice Subatomic Particles practice problems.