At
元素符号:At #
中文名称:砹
英文名称:Astatine
原子序数:85
原子量:(210)
外围电子排布:6s2 6p5
核外电子排布:2,8,18,32,18,7
常见化合价:+1,+3,+5,+7
密度:
溶点:302
沸点:337
所属周期:6
所属族数:VIIA
原子半径:1.43
离子半径:
共价半径:1.45
同位素及放射性:At-210(放 εα)
发现人:D.R.Corson, K.R.MacKenzie, E.Segr
发现时间:1940
发现地点:美国
名称由来:Greek: astatos (unstable).
元素描述:Unstable, radioactive member of the halogen group.
元素来源:Does not occur in nature. Similar to iodine. Produced by bombarding bismuth with alpha particles.
元素用途:Since its isotopes have such short half-lives there are no commercially significant compounds of astatine.