We’re being asked to place the given ions 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 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.
Place the following in order of increasing radius.
Ca2+, Cl-, S2-
a) Ca2+ < Cl- < S2-
b) Cl- < Ca2+ < S2-
c) S2- < Cl- < Ca2+
d) Ca2+ < S2- < Cl-
e) Cl- < S2- < Ca2+
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 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.
What professor is this problem relevant for?
Based on our data, we think this problem is relevant for Professor Naber's class at University of Wisconsin - Whitewater.