This is a list of 194 sources that list elements classified as metalloids. The sources are listed in chronological order. Lists of metalloids differ since there is no rigorous widely accepted definition of metalloid (or its occasional alias, 'semi-metal'). Individual lists share common ground, with variations occurring at the margins. The elements most often regarded as metalloids are boron, silicon, germanium, arsenic, antimony and tellurium. Other sources may subtract from this list, add a varying number of other elements, or both.
Overview
Element Citations Frequency in n = 194publications 194 = 100% Arsenic As191.599%Tellurium Te190.598%Germanium Ge184.595%Silicon Si183.595%Antimony Sb169.587%Boron B16686%Polonium Po94.549%Astatine At7740%Selenium Se4624%Aluminium Al189.3%Carbon C16.58.5% Bismuth Bi11.55.9% Phosphorus P105.2% Beryllium Be7.53.9% Tin Sn5.52.8% Sulfur S31.5% Livermorium Lv31.5% Iodine I2.51.3% Flerovium Fl10.5% Gallium Ga10.5% Hydrogen H10.5% Lead Pb10.5% Moscovium Mc10.5% Tennessine Ts10.5%
Chronological list This table shows which elements are included in each of 194 different lists of metalloids. A parenthesized symbol indicates an element whose inclusion in a particular metalloid list is qualified in some way by the author(s). The 'citations' rows show how many and what percentage of the authorities consider each element to be a metalloid, with qualified citations counted as one-half.