Dysprosium (Dy)
Dysprosium is the chemical element with atomic number 66 and symbol Dy. It is a lanthanoid in period 6, with a standard atomic weight of 162.5 u.
Key facts
- Z
- 66
- Atomic weight
- 162.5 u
- Category
- lanthanoid
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1886
- CAS
- 7429-91-6
Measured properties
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.22 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,685 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 2,840 K | National Center for Biotechnology Information (NIH) |
| Density stp | 8.55 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 229 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 573 kJ/mol | National Center for Biotechnology Information (NIH) |
Electron configuration
- Noble gas notation
- [Xe] 4f¹⁰ 6s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁰ 5s² 5p⁶ 6s²
- Electrons per shell
- 2, 8, 18, 28, 8, 2