Problem: The ionic substance strontium oxide, SrO, forms from the direct reaction of strontium metal with molecular oxygen. The arrangement of the ions in solid SrO is analogous to that in solid NaCl and is shown here. In the figure, do the large spheres represent Sr2+ ions or O2- ions?

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We are asked to determine what ion is represented by the large spheres.

A diagram shows a three by three cube with alternating strontium and oxygen atoms.

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Problem Details

The ionic substance strontium oxide, SrO, forms from the direct reaction of strontium metal with molecular oxygen. The arrangement of the ions in solid SrO is analogous to that in solid NaCl and is shown here.

 A diagram shows a three by three cube with alternating strontium and oxygen atoms.

In the figure, do the large spheres represent Sr2+ ions or O2- ions?

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