Radij
88
Ra
Skupina
2
Perioda
7
Blok
s
Protoni
Elektroni
Nevtroni
88
88
138
Splošne lastnosti
Vrstno število
88
Atomska teža
[226]
Masno število
226
Kategorija
Zemljoalkalijske kovine
Barva
Srebrna
Radioaktivno
Da
From the Latin word radius meaning ray
Kristalna struktura
Telesno centrirana kubična
Zgodovina
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.
Elektroni po lupinah
2, 8, 18, 32, 18, 8, 2
Razporeditev elektronov
[Rn] 7s2
Radium imparts a carmine red color to a flame
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
5,5 g/cm3
Tališče
973,15 K | 700 °C | 1292 °F
Vrelišče
2010,15 K | 1737 °C | 3158,6 °F
Talilna toplota
8 kJ/mol
Izparilna toplota
125 kJ/mol
Toplotna kapaciteta
- J/g·K
Zastopanost v Zemljini skorji
9,9×10-12%
Zastopanost v vesolju
n/p
CAS številka
7440-14-4
PubChem CID številka
6328144
Atomske lastnosti
Atomski polmer
-
Kovalentni polmer
221 pm
Elektronegativnost
0,9 (Paulingova lestvica)
Ionizacijski potencial
5,2784 eV
Atomski volumen
45,20 cm3/mol
Toplotna prevodnost
0,186 W/cm·K
Oksidacijska stanja
2
Uporabe
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
Izotopi
Stabilni izotopi
-Nestabilni izotopi
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