We’re being asked to arrange the given isoelectronic series in order of decreasing ionic radius.
Recall that ionic radius is the size of an ion. The trend for the ionic radius is as follows: it increases from right to left and down a period in the periodic table. Ionic radius also increases with an increasing number of electrons.
For this problem, we need to do the following:
Step 1: Determine the electrons in each species.
Step 2: Compare the charges if they are isoelectronic.
What is the correct order of decreasing size of the following ions?
a. P3- > Cl- > K+ > Ca2+
b. Ca2+ > K+ > Cl- > P3-
c. K+ > Cl- > Ca2+ > P3-
d. K+ > Cl- > P3- > Ca2+
e. None of the above is correct.
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What scientific concept do you need to know in order to solve this problem?
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.
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