Electron Configurations and Atomic Radii for the Elements

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The electron configurations of elements 1 through 120 are displayed in a dash-and-arrow chart. You can move the slider to select an atomic number to see the corresponding element name and electron configuration. Also shown is a simple spherical model to represent the comparative size of the atom. The reference sphere has a radius of 248, one unit higher than the largest atomic radius, that of praseodymium. Covalent radius data is used when available; otherwise, a calculated value is used. When no data is available, only a static sphere appears.


The putative orbitals are a theoretical extrapolation.


Contributed by: Nick Colicchio, Lizzy Obarow and Rachel Petzoldt (April 2021)
Additional contributions by: Justine Perrotti and Heidi Hendrickson
(PChem Studio, Lafayette College)
Based on a program by: S. M. Blinder
Open content licensed under CC BY-NC-SA



All radius data was acquired from [1].


[1] M. Dayah. "Ptable: The Interactive Periodic Table." (Mar 23, 2021) ptable.com/#Property/Radius.

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