40Zr91.22
Zirconium
Transition Metal
Solid at STP
Period 5Group 4Block DDiscovered 1789
[Kr]5s2 4d2
Zirconium is a chemical element with symbol Zr and atomic number 40. The name of zirconium is taken from the name of the mineral zircon, the most important source of zirconium. The word zircon comes from the Persian word zargun زرگون, meaning "gold-colored".
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 40 |
| Atomic Mass | 91.22 u |
| Electron Configuration | [Kr]5s2 4d2 |
| Oxidation States | +4 |
| Electronegativity | 1.33 (Pauling) |
| Atomic Radius | 186 pm |
| Ionization Energy | 6.634 eV |
| Electron Affinity | 0.426 eV |
| Block | D |
Physical Properties
| Appearance | silvery white |
| Standard State | Solid |
| Melting Point | 2128 K (1854.8 °C) |
| Boiling Point | 4682 K (4408.9 °C) |
| Density | 6.52 g/cm³ |
| Molar Heat | 25.36 J/(mol·K) |
| CPK Color | #94E0E0 |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 5 |
| Group | 4 |
| Block | D |
Discovery
| Year Discovered | 1789 |
| Discovered By | Martin Heinrich Klaproth |
| Electron Shells | 2, 8, 18, 10, 2 |