Periodic Trend: Ionic Radius Video Lessons

Concept:

# Problem: Which isoelectronic series is correctly arranged in order of increasing radius?A) K+ &lt; Ca2+ &lt; Ar &lt; Cl-B) Cl- &lt; Ar &lt; K+ &lt; Ca2+C) Ca2+ &lt; Ar &lt; K+ &lt; Cl- D) Ca2+ &lt; K+ &lt; Ar &lt; Cl- E) Ca2+ &lt; K+ &lt; Cl- &lt; Ar

###### FREE Expert Solution

We’re being asked to arrange the given isoelectronic series in order of increasing radius

Recall that ionic radius is the size of an ion. The trend for 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.

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###### Problem Details

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