ثوريوم (Th)
ثوريوم is the chemical element with atomic number 90 and symbol Th. It is a أكتينيد in period 7, with a standard atomic weight of 232.04 u.
حقائق أساسية
- Z
- 90
- Atomic weight
- 232.04 u
- Category
- أكتينيد
- State at 298 K
- Solid
- Occurrence
- primordial, radioactive
- Discovered
- 1828
- CAS
- 7440-29-1
الخصائص المقيسة
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.3 | National Center for Biotechnology Information (NIH) |
| Melting point | 2,023 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 5,061 K | National Center for Biotechnology Information (NIH) |
| Density stp | 11.72 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 237 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 586.6 kJ/mol | National Center for Biotechnology Information (NIH) |
التوزيع الإلكتروني
- Noble gas notation
- [Rn] 6d² 7s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s² 6p⁶ 6d² 7s²
- Electrons per shell
- 2, 8, 18, 32, 18, 10, 2