Ionic Radii Trends

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Dominique Zuk 1G
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Joined: Wed Sep 21, 2016 2:58 pm

Ionic Radii Trends

Postby Dominique Zuk 1G » Sat Oct 22, 2016 6:21 pm

On page 70 in the Course Reader, a diagram is presented that shows the ionic radii trends. As it states, the ionic radii trends increase down a group and decrease across a period. However, the diagram shows the radii initially decreasing, then enlarging and decreasing again (i notice the periodic table is only showing the s-block and p-block trends. Why does the ionic radii enlarge again at the beginning of the p-block?

Jessica Chern 1H
Posts: 22
Joined: Sat Jul 09, 2016 3:00 am

Re: Ionic Radii Trends

Postby Jessica Chern 1H » Sat Oct 22, 2016 6:27 pm

The s-block forms cations (with a positive charge), so the loss of an electron/electrons causes a smaller radius. However, the radii also decreases due to the increasing nuclear charge. The p-block forms anions (with a negative charge), so the addition of an electron/electrons causes a larger radius. The radii of anions are bigger than the radii of cations.

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