Electron Configurations and Atomic Radii for the Elements
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.[more]
The putative orbitals are a theoretical extrapolation.[less]
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 .
 M. Dayah. "Ptable: The Interactive Periodic Table." (Mar 23, 2021) ptable.com/#Property/Radius.