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10 May, 20:04

Write the formula for calcium chloride. Explain how you determined this formula

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  1. 10 May, 22:15
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    Calcium forms an ion with a positive 2 charge and chlorine forms an ion with a negative one charg, so the formula is CaC l2

    Group 1 metals and group 2 metals form positive ions by losing 1 and 2 electrons respectively. Non-metals in group 17 gain 1, group 16 gain 2 and group 15 gain 3. Elements which lose electrons form positive ions while elements that gain electrons form negative ions.

    To write a formula, you must balance charges so the overall charge is zero. A simple way to do this is to swap the # of the ion's charge and make it the subscript of the other ion. However, leave off the number 1 and reduce to lowest whole number ratio.
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