At
Astatine is a Metalloids element with the symbol At and atomic number 85. Located in period 6, group 17 (p-block), it has an atomic weight of 210 u and is classified as a solid at standard temperature and pressure. First identified in 1940 by Dale R. Corson in USA. Astatine has an electron configuration of [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵ with 6 electron shells containing 2, 8, 18, 32, 18, 7 electrons respectively. It is commonly used in: research only, potential cancer treatment.
砹是一种准金属元素,符号为At,原子序数为85。位于第6周期,第17族(p区),原子量为210 u,在标准温度和压力下为固体。于1940 年首次被确认,由Dale R. Corson发现。砹的电子排布为[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵,具有6个电子层,分别含有2、8、18、32、18、7个电子。常见用途包括:仅用于研究,潜在癌症治疗。
Basic Properties基本属性
- Atomic Number原子序数
- 85
- Atomic Weight原子量
- 210 u
- Category分类
- Metalloids准金属
- State at STP标准状态
- Solid固体
- Period周期
- 6
- Group族
- 17
- Block区
- p-blockp区
Physical Properties物理性质
- Melting Point熔点
- +302°C
- Boiling Point沸点
- +337°C
- Density密度
- 7.00 g/cm³
- Crystal Structure晶体结构
- —
- Atomic Radius原子半径
- 127 pm
- Ionic Radius离子半径
- —
- Electronegativity电负性
- 2.2
Electron Configuration电子排布
- Config电子构型
- [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵
- Shells电子层
- 2, 8, 18, 32, 18, 7
- Oxidation States氧化态
- -1, +1, +3, +5, +7
Electron Shells电子层结构
Discovery发现历史
- Year年份
- 19401940 年
- Discoverer发现者
- Dale R. Corson
- Country国家
- USA美国
Uses & Applications用途
Research only, potential cancer treatment
仅用于研究,潜在癌症治疗
Common Compounds常见化合物
—
—
Room Temperature常温特性
unknown (too rare to observe)
未知(太稀有无法观测)
Did You Know? 你知道吗?
The name Astatine comes from At and it was first identified in 1940.
砹的名称来源于其符号At,于1940年首次被确认。
Memory Aid记忆口诀
The rarest naturally occurring element
地球上最稀有的天然元素
Appearance外观
unknown (too rare to observe)
未知(太稀有无法观测)
Safety Information安全须知
- Radioactive — handle only in licensed facilities with proper shielding.
- 放射性元素——仅在持证设施中并使用适当防护的情况下处理。