DescriptionElectronshell004beryllium.png English: Electronshell diagram for Beryllium, the 4th element in the periodic table of elements. Source Application:
DescriptionElectronshell004Beryllium.svg English: Electronshell diagram for beryllium, the 4th element in the periodic table of elements. Source File:Electron
Avogadro number, Ng is the mass electron density (7Vg=ArA-(Z/^)=electrons per gram) and pNg is the electron density in
electrons/cm1. The effective Z/A, is