Radij

88
Ra
Skupina
2
Perioda
7
Blok
s
Protons
Electrons
Neutrons
88
88
138
General Properties
Vrstno število
88
Atomska teža
[226]
Mass Number
226
Kategorija
Zemljoalkalijske kovine
Barva
Silver
Radioactive
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.
Electrons per shell
2, 8, 18, 32, 18, 8, 2
Razporeditev elektronov
[Rn] 7s2
Ra
Radium imparts a carmine red color to a flame
Physical Properties
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
-
Abundance in Earth's crust
9,9×10-12%
Abundance in Universe
n/a
Pierre
Zasluge za slike: hp.ujf.cas.cz
Pierre and Marie Curie in the laboratory
CAS Number
7440-14-4
PubChem CID Number
6328144
Atomic Properties
Atomski polmer
-
Kovalentni polmer
221 pm
Elektronegativnost
0,9 (Paulingova lestvica)
Ionization Potential
5,2784 eV
Atomic Volume
45,20 cm3/mol
Toplotna prevodnost
0,186 W/cm·K
Oksidacijska stanja
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