GOB Chemistry

Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.

Atoms and the Periodic Table

Periodic Trend: Atomic Radius (Simplified)

The atomic radius of an element is the distance from its nucleus to its outer electron shell.

Atomic Radius

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concept

Periodic Trend: Atomic Radius (Simplified) Concept 1

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Periodic Trend: Atomic Radius (Simplified) Concept 2

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Moving towards the top right corner of the Periodic Table causes the atomic radii to decrease.

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Periodic Trend: Atomic Radius (Simplified) Example 1

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Problem

Which alkaline earth metal has the smallest atomic radius? 

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Problem

Which alkaline earth metal has the largest atomic radius?

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Problem

Arrange the following atoms in order of decreasing atomic radius:Sr, Se, Ne, Ga