Hydrogen vs Arsenic
| Property | H Hydrogen | As Arsenic |
|---|---|---|
| Atomic number | 1 | 33 |
| Symbol | H | As |
| Name | Hydrogen | Arsenic |
| Category | nonmetal | metalloid |
| Standard Atomic Weight | 1.007975 u | 74.921595 u |
| Period | 1 | 4 |
| Group | 1 | 15 |
| Block | s | p |
| Phase at STP | gas | solid |
| Electron configuration | 1s1 | [Ar]4s23d104p3 |
| Oxidation states | [-1, 1] | [-3, -2, -1, 0, 1, 2, 3, 4, 5] |
| Electronegativity (Pauling) | 2.2 | 2.18 |
| Electron affinity | 0.75419 eV | 0.81 eV |
| Density | 0.08988 kg/m³ | 5776 kg/m³ |
| Melting point | -259.34 °C | 816.85 °C |
| Boiling point | -252.87 °C | 613.85 °C |
| Discovery year | 1766 | 1250 |