Radium
88
Ra
Gruppe
2
Periode
7
Blok
s
Protoner
Elektroner
Neutroner
88
88
138
Generelle Egenskaber
Atomnummer
88
Atommasse
[226]
Masseantal
226
Kategori
Jordalkalimetaller
Farve
Sølv
Radioaktiv
Ja
From the Latin word radius meaning ray
Krystalstruktur
Rumcentreret Kubisk
Historie
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.
Elektroner i hver skal
2, 8, 18, 32, 18, 8, 2
Elektronkonfiguration
[Rn] 7s2
Radium imparts a carmine red color to a flame
Fysiske Egenskaber
Tilstandsform
Fast stof
Massefylde
5,5 g/cm3
Smeltepunkt
973,15 K | 700 °C | 1292 °F
Kogepunkt
2010,15 K | 1737 °C | 3158,6 °F
Smeltevarme
8 kJ/mol
Fordampningsvarme
125 kJ/mol
Varmefylde
-
Forekomst i jordskorpen
9,9×10-12%
Forekomst i universet
n/a
CAS-nummer
7440-14-4
PubChem CID-nummer
6328144
Atomare egenskaber
Atomradius
-
Kovalent radius
221 pm
Elektronegativitet
0,9 (Paulings skala)
Ioniseringspotentiale
5,2784 eV
Atomvolumen
45,20 cm3/mol
Varmeledningsevne
0,186 W/cm·K
Oxidationstrin
2
Anvendelser
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
Isotoper
Stabile isotoper
-Ustabile isotoper
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