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CLASSROOM SIMULATION · BETA

Atomic Radius Comparator

Choose two main-group elements from the same period or group, calculate a simplified effective nuclear charge, and compare their atomic radii.

KEY CONCEPTS

What controls atomic size?

  1. Atomic radius is commonly defined from the distance between bonded or neighboring nuclei.
  2. A higher principal energy level adds an electron shell and usually increases size.
  3. Across a period, increasing effective nuclear charge generally pulls valence electrons closer.
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