سيريوم (Ce)
سيريوم is the chemical element with atomic number 58 and symbol Ce. It is a لانثانيد in period 6, with a standard atomic weight of 140.12 u.
حقائق أساسية
- Z
- 58
- Atomic weight
- 140.12 u
- Category
- لانثانيد
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1804
- CAS
- 7440-45-1
الخصائص المقيسة
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.12 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,071 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 3,697 K | National Center for Biotechnology Information (NIH) |
| Density stp | 6.77 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 235 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 534.4 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 48.2 kJ/mol | National Center for Biotechnology Information (NIH) |
التوزيع الإلكتروني
- Noble gas notation
- [Xe] 4f¹ 5d¹ 6s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹ 5s² 5p⁶ 5d¹ 6s²
- Electrons per shell
- 2, 8, 18, 19, 9, 2