Arsenic vs Thulium
| Property | As Arsenic | Tm Thulium |
|---|---|---|
| Atomic number | 33 | 69 |
| Symbol | As | Tm |
| Name | Arsenic | Thulium |
| Category | metalloid | lanthanide |
| Standard Atomic Weight | 74.921595 u | 168.93422 u |
| Period | 4 | 6 |
| Group | 15 | N/A |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s23d104p3 | [Xe]6s24f13 |
| Oxidation states | [-3, -2, -1, 0, 1, 2, 3, 4, 5] | [0, 1, 2, 3] |
| Electronegativity (Pauling) | 2.18 | 1.25 |
| Electron affinity | 0.81 eV | 1.029 eV |
| Density | 5776 kg/m³ | 9320 kg/m³ |
| Melting point | 816.85 °C | 1544.85 °C |
| Boiling point | 613.85 °C | 1949.85 °C |
| Discovery year | 1250 | 1879 |