Hydrogen vs Chlorine
Side-by-side comparison of Hydrogen (H, element 1) and Chlorine (Cl, element 17) by atomic structure and physical properties.
| Property | H Hydrogen | Cl Chlorine |
|---|---|---|
| Atomic number | 1 | 17 |
| Symbol | H | Cl |
| Name | Hydrogen | Chlorine |
| Category | nonmetal | halogen |
| Standard Atomic Weight | 1.007975 u | 35.4515 u |
| Period | 1 | 3 |
| Group | 1 | 17 |
| Block | s | p |
| Phase at STP | Gas | Gas |
| Electron configuration | 1s1 | [Ne]3s23p5 |
| Oxidation states | [-1, 1] | [-1, 1, 2, 3, 4, 5, 6, 7] |
| Electronegativity (Pauling) | 2.2 | 3.16 |
| Electron affinity | 0.75419 eV | 3.6127 eV |
| Density | 0.08988 kg/m³ | 3.214 kg/m³ |
| Melting point | -259.193 °C | -101.5 °C |
| Boiling point | -252.781 °C | -34.04 °C |
| Discovery year | 1766 | 1774 |
Key Differences
| Property | H Hydrogen | Cl Chlorine |
|---|---|---|
| Standard Atomic Weight | 1.007975 u ↓ lower | 35.4515 u ↑ higher |
| Density | 0.08988 kg/m³ ↓ lower | 3.214 kg/m³ ↑ higher |
| Melting point | -259.193 °C ↓ lower | -101.5 °C ↑ higher |
| Boiling point | -252.781 °C ↓ lower | -34.04 °C ↑ higher |
| Electronegativity (Pauling) | 2.2 ↓ lower | 3.16 ↑ higher |
| Electron affinity | 0.75419 eV ↓ lower | 3.6127 eV ↑ higher |
| Period | 1 | 3 |
| Group | 1 | 17 |
| Block | s | p |
| Category | nonmetal | halogen |
| Electron configuration | 1s1 | [Ne]3s23p5 |
| Discovery year | 1766 | 1774 |