روبيديوم (Rb)
روبيديوم is the chemical element with atomic number 37 and symbol Rb. It is a فلز قلوي in period 5, group 1, with a standard atomic weight of 85.468 u.
حقائق أساسية
- Z
- 37
- Atomic weight
- 85.468 u
- Category
- فلز قلوي
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1861
- CAS
- 7440-17-7
الخصائص المقيسة
| Property | Value | Source |
|---|---|---|
| Electronegativity | 0.82 | National Center for Biotechnology Information (NIH) |
| Melting point | 312.46 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 961 K | National Center for Biotechnology Information (NIH) |
| Density stp | 1.53 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 303 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 403 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 45.2 kJ/mol | National Center for Biotechnology Information (NIH) |
التوزيع الإلكتروني
- Noble gas notation
- [Kr] 5s¹
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s¹
- Electrons per shell
- 2, 8, 18, 8, 1