هولميوم (Ho)
هولميوم is the chemical element with atomic number 67 and symbol Ho. It is a لانثانيد in period 6, with a standard atomic weight of 164.93 u.
حقائق أساسية
- Z
- 67
- Atomic weight
- 164.93 u
- Category
- لانثانيد
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1878
- CAS
- 7440-60-0
الخصائص المقيسة
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.23 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,747 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 2,973 K | National Center for Biotechnology Information (NIH) |
| Density stp | 8.8 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 216 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 581 kJ/mol | National Center for Biotechnology Information (NIH) |
التوزيع الإلكتروني
- Noble gas notation
- [Xe] 4f¹¹ 6s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹¹ 5s² 5p⁶ 6s²
- Electrons per shell
- 2, 8, 18, 29, 8, 2