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Antimony is a chemical element with symbol Sb and atomic number 51. [1] It is semimetallic chemical element, which can exist in two forms: the metallic form is bright, silvery, hard and brittle; the non-metallic form is a grey powder. Antimony is a poor conductor of heat and electricity; it is stable in dry air and is not attacked by dilute acids or alkalis. Antimony and some of its alloys expand on cooling. [2]
