Total valence electron:
Ca2+ = 20 – 2 = 18
P3- = 15 + 3 = 18
S2- = 16 + 2 = 18
Cl- = 17 + 1 = 18
K+ = 19 – 1 = 18
All of the ions are isoelectric
Rank these ions according to ionic radius.
Ca2+ P3- S2- Cl- K+
Frequently Asked Questions
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Our tutors have indicated that to solve this problem you will need to apply the Periodic Trend: Ionic Radius concept. You can view video lessons to learn Periodic Trend: Ionic Radius. Or if you need more Periodic Trend: Ionic Radius practice, you can also practice Periodic Trend: Ionic Radius practice problems.
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