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Ionic Radius on the Periodic Table

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Periodic Trends

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Ionic Radius on the Periodic Table

Chemistry

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You get to check out the trends in the properties of elements that are present in the structure of the Periodic Table. Explore trends in atomic radius, ionic radius, and electron affinity.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Define the concept of ionic radius.
  • Explain the change of ionic radius across the Periodic Table.

Everything You'll Have Covered

What happens to the atomic radius of an atom when it becomes a positively charged ion?

~ When an atom becomes a positively charged ion, it does so by losing an electron. When an electron is lost, the electrostatic repulsion between the remaining electrons decreases and, as a result, the atomic radius of the atom also decreases.

What happens to the atomic radius of an atom when it becomes a negatively charged ion?

~ When an atom becomes a negatively charged atom, it does so by gaining an electron. Upon gaining an electron, the electrostatic repulsion between the electrons grows stronger and, as a result, the atom's atomic radius increases.

In terms of how they form ions, what is the difference between the elements on either side of the Periodic Table?

~ The elements on the left side of the Periodic Table form smaller positive ions and the elements on the right side of the table form larger negative ions.

What phenomenon regarding ionic radius can be observed when you move from the top of a group of elements on the Periodic Table to the bottom?

~ When moving from the top of a group of elements on the Periodic Table to the bottom, you can observe that each element has an increasingly larger ionic radius.

Tutorial Details

Approximate Time 2 Minutes
Pre-requisite Concepts Students should be able to define the following terms: anion formation, anions, and cation formation.
Course Chemistry
Type of Tutorial Animation
Key Vocabulary anion formation, anions, cation formation