# Problem: List the following ions in order of increasing radius: Na+, O 2−, Mg 2+, F −, Al 3+. A) O 2− &gt; Mg 2+ &gt; F − &gt; Na+ &gt; Al 3+ B) Na+ &lt; Mg 2+ &lt; Al 3+ &lt; O 2− &lt; F − C) O 2− &lt; F − &lt; Na+ &lt; Mg 2+ &lt; Al 3+ D) Al 3+ &lt; Mg 2+ &lt; Na+ &lt; F − &lt; O 2− E) Na+ &lt; Mg 2+ &lt; Al 3+ &lt; F − &lt; O 2−

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###### Problem Details

List the following ions in order of increasing radius: Na+, O 2−, Mg 2+, F , Al 3+.

A) O 2− > Mg 2+ > F > Na+ > Al 3+

B) Na+ < Mg 2+ < Al 3+ < O 2− < F

C) O 2− < F − < Na< Mg 2+ < Al 3+

D) Al 3+ < Mg 2+ < Na< F − < O 2−

E) Na< Mg 2+ < Al 3+ < F − < O 2−

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.

What is the difficulty of this problem?

Our tutors rated the difficulty ofList the following ions in order of increasing radius: Na+, ...as medium difficulty.

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What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Marville's class at UIUC.