astatine

n.[化]砹

Any of a group of five chemically related nonmetallic elements including fluorine,chlorine,bromine,iodine,and astatine. 卤素包括氟、氯、溴、磺、砹有化学联系的五个非金属元素一族中的任何一个

Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine. 卤素包括氟、氯、溴、磺、砹有化学联系的五个非金属元素一族中的任何一个

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，包括五种化学性质类似的非金属元素:氟（F）、氯（Cl）、溴（Br）、碘（I）和（At）。

astatine should have the greatest tendency to form ??ations 砹应该具有形成阳离子?鬃畲蟮那阆颉?/UK>

any of the chemical elements fluorine or chlorine or bromine or iodine or astatine. 氟、氯、溴、碘、砹中任意一种化学元素。