Radium

88
Ra
Grupp
2
Period
7
Block
s
Protoner
Electrons
Neutroner
88
88
138
Generella Egenskaper
Atomnummer
88
Atommassa
[226]
Mass Number
226
Kategori
Alkaliska jordmetaller
Färg
Silver
Radioaktiv
Ja
From the Latin word radius meaning ray
Kristallstruktur
Rymdcentrerat kubisk
Historia
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.
Elektroner per skal
2, 8, 18, 32, 18, 8, 2
Elektronkonfiguration
[Rn] 7s2
Ra
Radium imparts a carmine red color to a flame
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
5,5 g/cm3
Smältpunkt
973,15 K | 700 °C | 1292 °F
Kokpunkt
2010,15 K | 1737 °C | 3158,6 °F
Smältvärme
8 kJ/mol
Ångbildningsvärme
125 kJ/mol
Specifik värmekapacitet
-
Abundance in Earth's crust
9,9×10-12%
Abundance in Universe
n/a
Pierre
Bildkrediter: hp.ujf.cas.cz
Pierre and Marie Curie in the laboratory
CAS Number
7440-14-4
PubChem CID Number
6328144
Atomära Egenskaper
Atomradie
-
Kovalent radie
221 pm
Elektronegativitet
0,9 (Paulingskalan)
Jonisationspotential
5,2784 eV
Molvolym
45,20 cm3/mol
Värmeledningsförmåga
0,186 W/cm·K
Oxidationstillstånd
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
Isotoper
Stabila isotoper
-
Instabila 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