Ra
Radium
Chikamu 88 · 226.02541 u
Alkaline Earth Metal
s- block
Chikamu 7
_Group 2
_Kukanganisa: at RT
Radioactive
t½ 1600 years
Wikipedia →
Radium isimbi ine simba rakawandisa rezvemakemikari, uye inoshandiswa zvakanyanya mukugadzira mapepa anopisa.
Maitiro ekushandisa
| Atomic radius: | 226.02541 u |
| Kuomarara | 5.5 g/cm³ |
| Kutonhora Point | 973.0 K |
| Kutonhora Point | 2010.0 K |
| Kuoneka | Silvery- white metallic |
| State at Room Temp | _Kukanganisa: |
Chemical zvinhu
| Electronegativity | 0.9 (Pauling) |
| 1st Ionization Energy | 509.3 kJ/mol |
| Electronegativity: | 9.65 kJ/mol |
| Oxygen | +2 |
Atomic Properties
| Kuisa Kugadzirisa | [Rn] 7s2 |
| Atomic radius: | 221.0 pm |
| Covalent Radius | 221.0 pm |
| Van der Waals radius | 283.0 pm |
Discovery
| Yakawanikwa ne | Marie Curie, Pierre Curie |
| Kuonekwa kwegore | 1898 |
| _Panzvimbo: | Paris, France |
| Akapihwa zita mushure me | Latin 'radius' meaning ray |
Nezve Radium
Radium is a luminous, silvery-white radioactive metal discovered by the Curies. It glows blue due to intense radioactivity. The 'Radium Girls' who painted watch dials suffered tragic radiation poisoning.
Mashandisiro & Maapplication
Yakanga yashandiswa mu luminous paint uye quack medicine. Nhasi zvinobva zvachinja mu radiation therapy.
Nhoroondo yemitambo
The 'Radium Girls' avo vakapedzisa maziso ezuva akasangana nehurombo hwekuuraya, izvo zvakatungamira mukugadzirwa kwemutemo wekuchengetedzwa kwebasa.
Isotopes
| Mamwe marudzi ezvinyorwa | Kuwanda | Half-Life | _Kuchengeta |
| 223 | - | 11.43 days | Hapana |
| 224 | - | 3.6319 days | Hapana |
| 226 | - | 1600 years | Hapana |
| 228 | - | 5.75 years | Hapana |
Kuisa Kugadzirisa
[Rn] 7s2