n.[化]砹

Any of a group of five chemically related nonmetallic elements including fluorine,chlorine,bromine,iodine,and astatine. 鹵素包括氟、氯、溴、磺、砹有化學(xué)聯(lián)系的五個(gè)非金屬元素一族中的任何一個(gè)

Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine. 鹵素包括氟、氯、溴、磺、砹有化學(xué)聯(lián)系的五個(gè)非金屬元素一族中的任何一個(gè)

Any of the five nonmetallic elements with similar chemical properties: fluorine, chlorine, bromine, iodine (I), and astatine (At). 周期表VIIa族元素，包括五種化學(xué)性質(zhì)類(lèi)似的非金屬元素:氟（F）、氯（Cl）、溴（Br）、碘（I）和（At）。

astatine should have the greatest tendency to form ??ations 砹應(yīng)該具有形成陽(yáng)離子?鬃畬蟮那閬頡?/UK>

any of the chemical elements fluorine or chlorine or bromine or iodine or astatine. 氟、氯、溴、碘、砹中任意一種化學(xué)元素。