Радиум

88
Ra
Група
2
Периода
7
блок
s
Protons
Electrons
Neutrons
88
88
138
Општи Својства
Атомски број
88
Атомска тежина
[226]
Mass Number
226
Category
Земноалкален метал
Color
Silver
Radioactive
Да
From the Latin word radius meaning ray
Кристална структура
Body Centered Cubic
History
Radium was discovered by Marie Curie and Pierre Curie in 1898.

They extracted the radium compound from a uraninite sample.

Radium was isolated in its metallic state by Marie Curie and André-Louis Debierne in 1910 through the electrolysis of radium chloride by using a mercury cathode and distilling in an atmosphere of hydrogen gas.
Electrons per shell
2, 8, 18, 32, 18, 8, 2
Електронска конфигурација
[Rn] 7s2
Ra
Radium imparts a carmine red color to a flame
Физички Својства
Фаза
Solid
Густина
5,5 g/cm3
Точка на топење
973,15 K | 700 °C | 1292 °F
Точка на вриење
2010,15 K | 1737 °C | 3158,6 °F
Топлина на топење
8 kJ/mol
Топлина на испарување
125 kJ/mol
Specific Heat Capacity
-
Abundance in Earth's crust
9,9×10-12%
Abundance in Universe
Нема одговор
Pierre
Кредити на слика: hp.ujf.cas.cz
Pierre and Marie Curie in the laboratory
CAS Number
7440-14-4
PubChem CID Number
6328144
Атомски Својства
Атомски полупречник
-
Ковалентен полупречник
221 pm
Електронегативност
0,9 (Полингова скала)
Ionization Potential
5,2784 eV
Atomic Volume
45,20 cm3/mol
Thermal Conductivity
0,186 W/cm·K
Oxidation States
2
Applications
Radium was formerly used in self-luminous paints for watches, nuclear panels, aircraft switches, clocks, and instrument dials.

Radium chloride was used in medicine to produce radon gas which in turn was used as a cancer treatment.

The isotope 223Ra is currently under investigation for use in medicine as a cancer treatment of bone metastasis.
Radium is highly radioactive and carcinogenic
Isotopes
Stable Isotopes
-
Unstable Isotopes
202Ra, 203Ra, 204Ra, 205Ra, 206Ra, 207Ra, 208Ra, 209Ra, 210Ra, 211Ra, 212Ra, 213Ra, 214Ra, 215Ra, 216Ra, 217Ra, 218Ra, 219Ra, 220Ra, 221Ra, 222Ra, 223Ra, 224Ra, 225Ra, 226Ra, 227Ra, 228Ra, 229Ra, 230Ra, 231Ra, 232Ra, 233Ra, 234Ra