We’re being asked to determine the proper sequence of the given isoelectronic series based on increasing ionic radius. An isoelectronic series means the given ions have the same number of electrons.
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 compare the charges of the ions in the isoelectronic series.
This will help us arrange the ions in increasing ionic radius.
Which isoelectronic series is correctly arranged in order of increasing radius?
a. K+ < Ca2+ < Ar < Cl -
b. Cl - < Ar < K+ < Ca2+
c. Ca2+ < Ar < K+ < Cl -
d. Ca2+ < K+ < Ar < Cl -
e. Ca2+ < K+ < Cl - < Ar
Frequently Asked Questions
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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