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+
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