![]() Alternatively, given the near-metallic character of its lighter congener iodine, a succession of authors suggest astatine may be a metal. Chemically, studies on trace quantities of astatine, which are not necessarily reliable, have demonstrated characteristics of both metals and nonmetals. As a halogen it has usually been presumed to be a nonmetal. With no comprehensive understanding of its bulk properties, its classification remains uncertain. Due to its rarity and extreme radioactivity it is frequently ignored in the literature. Opinions differ as to the status of astatine. ![]() Of the 118 known elements, roughly 20% are classified as nonmetals. This article includes the metalloids for comparison.
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