Fr
Francium is a Alkali Metals element with the symbol Fr and atomic number 87. Located in period 7, group 1 (s-block), it has an atomic weight of 223 u and is classified as a solid at standard temperature and pressure. First identified in 1939 by Marguerite Perey in France. Francium has an electron configuration of [Rn] 7s¹ with 7 electron shells containing 2, 8, 18, 32, 18, 8, 1 electrons respectively. It is commonly used in: research only.
钫是一种碱金属元素,符号为Fr,原子序数为87。位于第7周期,第1族(s区),原子量为223 u,在标准温度和压力下为固体。于1939 年首次被确认,由Marguerite Perey发现。钫的电子排布为[Rn] 7s¹,具有7个电子层,分别含有2、8、18、32、18、8、1个电子。常见用途包括:仅用于研究。
Basic Properties基本属性
- Atomic Number原子序数
- 87
- Atomic Weight原子量
- 223 u
- Category分类
- Alkali Metals碱金属
- State at STP标准状态
- Solid固体
- Period周期
- 7
- Group族
- 1
- Block区
- s-blocks区
Physical Properties物理性质
- Melting Point熔点
- +27°C
- Boiling Point沸点
- +677°C
- Density密度
- 1.87 g/cm³
- Crystal Structure晶体结构
- Body-Centered Cubic (BCC)体心立方
- Atomic Radius原子半径
- —
- Ionic Radius离子半径
- 180 pm
- Electronegativity电负性
- 0.7
Electron Configuration电子排布
- Config电子构型
- [Rn] 7s¹
- Shells电子层
- 2, 8, 18, 32, 18, 8, 1
- Oxidation States氧化态
- +1
Electron Shells电子层结构
Discovery发现历史
- Year年份
- 19391939 年
- Discoverer发现者
- Marguerite Perey
- Country国家
- France法国
Uses & Applications用途
Research only
仅用于研究
Common Compounds常见化合物
—
—
Room Temperature常温特性
unknown
未知
Did You Know? 你知道吗?
The name Francium comes from Fr and it was first identified in 1939.
钫的名称来源于其符号Fr,于1939年首次被确认。
Memory Aid记忆口诀
Extremely rare and radioactive
最稀有的碱金属
Appearance外观
unknown
未知
Safety Information安全须知
- Radioactive — handle only in licensed facilities with proper shielding.
- Extremely reactive with water — store under mineral oil. Can cause fire or explosion on water contact.
- 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。
- 与水极度反应——储存于矿物油中。遇水可引发火灾或爆炸。