How are the size of atoms determined?

General Discussion
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Out of curiosity, how is the size of the spheres determined for each atom?

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They’re fractions of the VdW radius:

    auto radius = Elements::radiusVDW(atomicNumber);

Where we use the VdW radii in: Alvarez, et. al. Dalton Trans. (2013) 42, pp. 8617-8636 doi: 10.1039/C3DT50599E

The UI slider changes the fraction used in the ball-and-stick model (from 0.1 to 0.9 times VdW radius).

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