Radyum
88
Ra
Grup
2
Periyot
7
Blok
s
Protonlar
Elektronlar
Nötronlar
88
88
138
Temel Özellikleri
Atom numarası
88
Atom ağırlığı
[226]
Kütle Numarası
226
Kategori
Alkali toprak metalleri
Renk
Gümüşi
Radyoaktif
Evet
From the Latin word radius meaning ray
Kristal yapısı
Hacim merkezli kübik
Tarihi
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.
Enerji seviyesi başına Elektronlar
2, 8, 18, 32, 18, 8, 2
Elektron dizilimi
[Rn] 7s2
Radium imparts a carmine red color to a flame
Fiziksel Özellikleri
Faz
Katı
Yoğunluk
5,5 g/cm3
Ergime noktası
973,15 K | 700 °C | 1292 °F
Kaynama noktası
2010,15 K | 1737 °C | 3158,6 °F
Ergime ısısı
8 kJ/mol
Buharlaşma ısısı
125 kJ/mol
Isı kapasitesi
-
Dünya kabuğundaki bulunulabilirliği
9,9×10-12%
Evrendeki bulunulabilirliği
yok
CAS Numarası
7440-14-4
PubChem CID Numarası
6328144
Atom Özellikleri
Atom yarıçapı
-
Kovalent yarıçapı
221 pm
Elektronegatifliği
0,9 (Pauling ölçeği)
İyonlaşma enerjisi
5,2784 eV
Atomik Hacim
45,20 cm3/mol
Isıl iletkenlik
0,186 W/cm·K
Yükseltgenme seviyeleri
2
Uygulamalar
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
İzotoplar
Kararlı izotoplar
-Kararsız izotoplar
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