碘者,化學元素也,符號I,原子序五十三,屬鹵素也。乃紫色固體,釋紫氣。易昇華,欲液化之,需加壓其汽矣。
碘乃鹵素,居其四也;固體也,然受熱易昇華,亦易擴散,故盛其之器皆易染其色。
碘活潑甚,熱之,則可與金屬反應。然碘離子之還原性,亦非弱也,強甚于亞鐵離子。是故鐵離子可氧化之,以碘氧化鐵亦無所謂「碘化鐵」。
碘之化合價者,負一,正一三五七云云。
同位素者三十,性穩者獨碘一二七也。
碘一三一者,常衰變,可治癌矣。
碘酒者,可作消毒劑矣。
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