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This is an accepted version of this page This is the latest accepted revision, reviewed on 19 January 2025. Periodic table of the elements with eight or more periods Extended periodic table Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium ...
Atomic number (Z): 120: Group: group 2 (alkaline earth metals) Period: period 8 (theoretical, extended table): Block s-block Electron configuration [] 8s 2 (predicted) [1Electrons per shell
Shortly after the discovery of rubidium, Crookes found a new green line in a selenium sample; later that year, Lamy found the element to be metallic. [133] 49 Indium: 1863 F. Reich and T. Richter: 1864 T. Richter Reich and Richter first identified it in sphalerite by its bright indigo-blue spectroscopic emission line. [134]