Jisho

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はんけい 半径
Noun
1. ionic radius
Wikipedia definition
2. Ionic radiusIonic radius, rion, is the radius of an atom's ion. Although neither atoms nor ions have sharp boundaries, it is important to treat them as if they are hard spheres with radii such that the sum of ionic radii of the cation and anion gives the distance between the ions in a crystal lattice. Ionic radii are typically given in units of either picometers (pm) or Angstroms (Å), with 1 Å = 100 pm. Typical values range from 30 pm (0.3 Å) to over 200 pm (2 Å).
Read “Ionic radius” on English Wikipedia
Read “イオン半径” on Japanese Wikipedia
Read “Ionic radius” on DBpedia

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