La
Lanthanum is a Lanthanides element with the symbol La and atomic number 57. Located in period 6, group 3 (f-block), it has an atomic weight of 138.91 u and is classified as a solid at standard temperature and pressure. First identified in 1839 by Carl Gustaf Mosander in Sweden. Lanthanum has an electron configuration of [Xe] 5d¹ 6s² with 6 electron shells containing 2, 8, 18, 18, 9, 2 electrons respectively. It is commonly used in: camera lenses, hydrogen storage, flint lighters.
镧是一种镧系元素元素,符号为La,原子序数为57。位于第6周期,第3族(f区),原子量为138.91 u,在标准温度和压力下为固体。于1839 年首次被确认,由Carl Gustaf Mosander发现。镧的电子排布为[Xe] 5d¹ 6s²,具有6个电子层,分别含有2、8、18、18、9、2个电子。常见用途包括:相机镜头,储氢,打火石。
Basic Properties基本属性
- Atomic Number原子序数
- 57
- Atomic Weight原子量
- 138.91 u
- Category分类
- Lanthanides镧系元素
- State at STP标准状态
- Solid固体
- Period周期
- 6
- Group族
- 3
- Block区
- f-blockf区
Physical Properties物理性质
- Melting Point熔点
- +918°C
- Boiling Point沸点
- +3464°C
- Density密度
- 6.14 g/cm³
- Crystal Structure晶体结构
- Hexagonal Close-Packed (HCP)六方密堆积
- Atomic Radius原子半径
- 187 pm
- Ionic Radius离子半径
- 103 pm
- Electronegativity电负性
- 1.1
Electron Configuration电子排布
- Config电子构型
- [Xe] 5d¹ 6s²
- Shells电子层
- 2, 8, 18, 18, 9, 2
- Oxidation States氧化态
- +3
Electron Shells电子层结构
Discovery发现历史
- Year年份
- 18391839 年
- Discoverer发现者
- Carl Gustaf Mosander
- Country国家
- Sweden瑞典
Uses & Applications用途
Camera lenses, hydrogen storage, flint lighters
相机镜头,储氢,打火石
Common Compounds常见化合物
—
—
Room Temperature常温特性
silvery white
银白色
Did You Know? 你知道吗?
The name Lanthanum comes from La and it was first identified in 1839.
镧的名称来源于其符号La,于1839年首次被确认。
Memory Aid记忆口诀
First of the lanthanide series
镧系元素之首
Appearance外观
silvery white
银白色
Safety Information安全须知
- Handle with standard laboratory precautions. Refer to the Safety Data Sheet (SDS) for detailed handling instructions.
- 按照标准实验室预防措施处理。详细操作说明请参阅安全数据表(SDS)。