The poor metals among the BCNOs usually include aluminum,gallium, indium, thallium, tin, lead, and bismuth. The metalloidsare boron, silicon, germanium, arsenic, antimony, tellurium, andpolonium. The nonmetals are carbon, nitrogen, oxygen, phospho-rus, sulfur and selenium. These groups are not “official,” and chem-ists sometimes disagree on whether a particular element like boronshould be called a metal or a metalloid.
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