Periodic Trends: Ionic Radius Video Lessons

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Concept: Understanding ionic radius

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Example: Rank each set of ions in order of increasing ionic size.  a)  K+ , Ca2+, Ar b)  Sr2+, Na+, I – c)   V5+, S2-, Cl –

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?

FREE Expert Solution

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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All Chemistry Practice Problems Periodic Trends: Ionic Radius Practice Problems
Q.Why are Se2- and Br- are about the same size?
Q.Choose the larger atom or ion from each pair.(a) K or K+(b) F or F–(c) Ca2+ or Cl–
Q.Arrange this isoelectronic series in order of decreasing radius: F–, O2–, Mg2+, Na+.
Q.Pick the larger species from each of the following pairs.I– or Cs+
See all problems in Periodic Trends: Ionic Radius

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