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Periodic Table of Balloons demonstrates the periodic trends of atomic and ionic radius. (Blue: Atoms; Green: Cations; White: Anions). Lines made with blue painters' tape. (Nov 2011)

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<p>In this interactive activity from the American Chemical Society, explore patterns in the periodic table. See how the electron configurations and properties of the elements vary according to their place in the table. Investigate the patterns by plotting and comparing the elements by molar mass, atomic radius, ionic radius, melting point, boiling point, electronegativity, and ionization energies.</p>

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This shows some of the elements Ionic radius. Potassium is K. The Ionic radius is 133.

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This shows the atomic radius and also the ionic radius for magnesium.