1. Here is a brief description of astatine. 砹的颜色是什么?
2. 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。
3. 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。
英英解释
n.
1. a highly unstable radioactive element (the heaviest of the halogen series); a decay product of urani