Radi
88
Ra
Grup
2
Període
7
Bloc
s
Protons
Electrons
Neutrons
88
88
138
Propietats Generals
Nombre atòmic
88
Massa atòmica
[226]
Nombre de massa
226
Categoria
Alcalinoterris
Color
Plata
Radioactiu
Sí
From the Latin word radius meaning ray
Estructura cristal·lina
Cos cúbic centrat
Història
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.
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 capa
2, 8, 18, 32, 18, 8, 2
Configuració electrònica
[Rn] 7s2
Radium imparts a carmine red color to a flame
Propietats Físiques
Fase
Sòlid
Densitat
5,5 g/cm3
Punt de fusió
973,15 K | 700 °C | 1292 °F
Punt d'ebullició
2010,15 K | 1737 °C | 3158,6 °F
Entalpia de fusió
8 kJ/mol
Entalpia de vaporització
125 kJ/mol
Capacitat tèrmica específica
-
Abundància a l'escorça terrestre
9,9×10-12%
Abundància a l'univers
n/a
Número CAS
7440-14-4
Número CID de PubChem
6328144
Propietats Atòmiques
Radi atòmic
-
Radi covalent
221 pm
Electronegativitat
0,9 (Escala de Pauling)
Potencial d'ionització
5,2784 eV
Volum atòmic
45,20 cm3/mol
Conductivitat tèrmica
0,186 W/cm·K
Estats d'oxidació
2
Aplicacions
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 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
Isòtops
Isòtops estables
-Isòtops inestables
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