88Ra
碱土金属
镭 Ra
Radium
物态与数值
- 物态
- 固态
- 周期／族
- 7／2
- 相对原子质量
- 226.0 （不是质量数）
- 原始密度
- 5.5 g/cm3
- 归一化密度
- 5.5 g/cm³
- 来源熔点字段
- 1233.0 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
- 2010.0 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。
Radium is a chemical element with symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is almost colorless, but it readily combines with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride (Ra3N2).
出处、中文名称与原始字段
- 来源位置
- multisubject/elements/raw/PeriodicTableJSON.json#/elements/87
- 原记录摘要
- 05e478cb1192c5bbfad8d9600fd3b4c7902c0966ad5d0408bfcc4d5092424c0d
- boil
- 2010
- melt
- 1233
- name
- Radium
- xpos
- 2
- ypos
- 7
- block
- s
- group
- 2
- image
- {'url': 'https://upload.wikimedia.org/wikipedia/commons/b/bb/Radium226.jpg', 'title': 'Radium electroplated on a very small sample of copper foil and covered with polyurethane to prevent reaction with the air', 'attribution': 'grenadier, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons'}
- phase
- Solid
- wxpos
- 2
- wypos
- 7
- number
- 88
- period
- 7
- shells
- [2, 8, 18, 32, 18, 8, 2]
- source
- https://en.wikipedia.org/wiki/Radium
- symbol
- Ra
- cpk-hex
- 007d00
- density
- 5.5
- summary
- Radium is a chemical element with symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is almost colorless, but it readily combines with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride (Ra3N2).
- category
- alkaline earth metal
- named_by
- 未知
- appearance
- silvery white metallic
- molar_heat
- 未知
- atomic_mass
- 226
- atomic_radii
- {'metallic': None, 'empirical': [215], 'calculated': None, 'van_der_waals': [283], 'covalent_single': [201], 'covalent_triple': [159]}
- density_unit
- g/cm3
- spectral_img
- 未知
- bohr_model_3d
- https://storage.googleapis.com/search-ar-edu/periodic-table/element_088_radium/element_088_radium.glb
- density_g_cm3
- 5.5
- discovered_by
- Pierre Curie
- bohr_model_image
- https://storage.googleapis.com/search-ar-edu/periodic-table/element_088_radium/element_088_radium_srp_th.png
- electron_affinity
- 9.6485
- ionization_energies
- [509.3, 979]
- electron_configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2
- electronegativity_pauling
- 0.9
- electron_configuration_semantic
- [Rn] 7s2