2He
稀有气体
氦 He
Helium
物态与数值
- 物态
- 气态
- 周期／族
- 1／18
- 相对原子质量
- 4.0026022 （不是质量数）
- 原始密度
- 0.1786 g/L
- 归一化密度
- 0.0001786 g/cm³
- 来源熔点字段
- 0.95 K（部分来源实际为三相点，教学前需核对条件）
- 来源沸点字段
- 4.222 K
部分超重元素属性为预测值，不能当作已审实验值。氢原始气体密度单位与归一化单位不同，均保留展示。
英文来源解释
中文翻译待补。
Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table. Its boiling and melting points are the lowest among all the elements.
出处、中文名称与原始字段
- 来源位置
- multisubject/elements/raw/PeriodicTableJSON.json#/elements/1
- 原记录摘要
- 05e478cb1192c5bbfad8d9600fd3b4c7902c0966ad5d0408bfcc4d5092424c0d
- boil
- 4.222
- melt
- 0.95
- name
- Helium
- xpos
- 18
- ypos
- 1
- block
- s
- group
- 18
- image
- {'url': 'https://upload.wikimedia.org/wikipedia/commons/0/00/Helium-glow.jpg', 'title': 'Vial of glowing ultrapure helium. Original size in cm: 1 x 5', 'attribution': 'Jurii, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/helium.php'}
- phase
- Gas
- wxpos
- 32
- wypos
- 1
- number
- 2
- period
- 1
- shells
- [2]
- source
- https://en.wikipedia.org/wiki/Helium
- symbol
- He
- cpk-hex
- d9ffff
- density
- 0.1786
- summary
- Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table. Its boiling and melting points are the lowest among all the elements.
- category
- noble gas
- named_by
- 未知
- appearance
- colorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field
- molar_heat
- 未知
- atomic_mass
- 4.0026022
- atomic_radii
- {'metallic': None, 'empirical': [120], 'calculated': [31], 'van_der_waals': [140], 'covalent_single': [46], 'covalent_triple': None}
- density_unit
- g/L
- spectral_img
- https://en.wikipedia.org/wiki/File:Helium_spectrum.jpg
- bohr_model_3d
- https://storage.googleapis.com/search-ar-edu/periodic-table/element_002_helium/element_002_helium.glb
- density_g_cm3
- 0.0001786
- discovered_by
- Pierre Janssen
- bohr_model_image
- https://storage.googleapis.com/search-ar-edu/periodic-table/element_002_helium/element_002_helium_srp_th.png
- electron_affinity
- -48
- ionization_energies
- [2372.3, 5250.5]
- electron_configuration
- 1s2
- electronegativity_pauling
- 未知
- electron_configuration_semantic
- 1s2