Krypton vs Yttrium
| Property | Kr Krypton | Y Yttrium |
|---|---|---|
| Atomic number | 36 | 39 |
| Symbol | Kr | Y |
| Name | Krypton | Yttrium |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 83.798 u | 88.90584 u |
| Period | 4 | 5 |
| Group | 18 | 3 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ar]4s23d104p6 | [Kr]5s24d1 |
| Oxidation states | [0, 1, 2] | [0, 1, 2, 3] |
| Electronegativity (Pauling) | 3 | 1.22 |
| Electron affinity | -1 eV | 0.307 eV |
| Density | 3.733 kg/m³ | 4470 kg/m³ |
| Melting point | -157.36 °C | 1521.85 °C |
| Boiling point | -153.42 °C | 3344.85 °C |
| Discovery year | 1898 | 1794 |