Radium
88
Ra
Groep
2
Periode
7
Blok
s
Protonen
Elektronen
Neutronen
88
88
138
Algemene Eigenschappen
Atoomnummer
88
Atomair gewicht
[226]
Massa Getal
226
Categorie
Aardalkalimetalen
Kleur
Zilver
Radioactief
Ja
From the Latin word radius meaning ray
Kristalstructuur
Ruimtelijk-gecentreerde Kubus
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.
Eletronen per schil
2, 8, 18, 32, 18, 8, 2
Electronconfiguratie
[Rn] 7s2
Radium imparts a carmine red color to a flame
Fysieke Eigenschappen
Fase
Vast
Dichtheid
5,5 g/cm3
Smeltpunt
973,15 K | 700 °C | 1292 °F
Kookpunt
2010,15 K | 1737 °C | 3158,6 °F
Fusiewarmte
8 kJ/mol
Verdampingswarmte
125 kJ/mol
Specifieke Warmtecapaciteit
-
Overvloedig aanwezig in de aardkorst
9,9×10-12%
Overvloedig aanwezig in het universum
n.v.t.
CAS-nummer
7440-14-4
PubChem CID nummer
6328144
Atoomeigenschappen
Atoomstraal
-
Covalentiestraal
221 pm
Electronegativiteit
0,9 (Pauling schaal)
Ionisatiepotentiaal
5,2784 eV
Atoomvolume
45,20 cm3/mol
Thermische geleiding
0,186 W/cm·K
Oxidatietoestanden
2
Toepassingen
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
Isotopen
Stabiele isotopen
-Instabiele isotopen
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