Roentgenium vs Copernicium
Side-by-side comparison of Roentgenium (Rg, element 111) and Copernicium (Cn, element 112) by atomic structure and physical properties.
| | |
|---|
| Atomic number | 111 | 112 |
|---|
| Symbol | Rg | Cn |
|---|
| Name | Roentgenium | Copernicium |
|---|
| Category | transition-metal | transition-metal |
|---|
| Standard Atomic Weight | 282 u | 285 u |
|---|
| Period | 7 | 7 |
|---|
| Group | 11 | 12 |
|---|
| Block | d | d |
|---|
| Phase at STP | N/A | Gas |
|---|
| Electron configuration | [Rn]5f146d97s2 (Predicted) | [Rn]5f146d107s2 (Predicted) |
|---|
| Oxidation states | [-1, 1, 3, 5] | [2, 4] |
|---|
| Electronegativity (Pauling) | N/A | N/A |
|---|
| Electron affinity | 1.565 eV | -0.8 eV |
|---|
| Density | 2.87e+4 kg/m³ | 1.4e+4 kg/m³ |
|---|
| Melting point | N/A | N/A |
|---|
| Boiling point | N/A | -165.15 °C |
|---|
| Discovery year | 1994 | 1996 |
|---|
Key Differences
| Rg Roentgenium | Cn Copernicium |
|---|
| Standard Atomic Weight | 282 u ↓ lower | 285 u ↑ higher |
|---|
| Density | 2.87e+4 kg/m³ ↑ higher | 1.4e+4 kg/m³ ↓ lower |
|---|
| Electron affinity | 1.565 eV ↑ higher | -0.8 eV ↓ lower |
|---|
| Group | 11 | 12 |
|---|
| Electron configuration | [Rn]5f146d97s2 (Predicted) | [Rn]5f146d107s2 (Predicted) |
|---|
| Discovery year | 1994 | 1996 |
|---|