73Ta180.9479
Tantalum
Transition Metal
Solid at STP
Period 6Group 5Block DDiscovered 1802
[Xe]6s2 4f14 5d3
Tantalum is a chemical element with symbol Ta and atomic number 73. Previously known as tantalium, its name comes from Tantalus, an antihero from Greek mythology. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant.
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Atomic Properties
| Atomic Number | 73 |
| Atomic Mass | 180.9479 u |
| Electron Configuration | [Xe]6s2 4f14 5d3 |
| Oxidation States | +5 |
| Electronegativity | 1.5 (Pauling) |
| Atomic Radius | 217 pm |
| Ionization Energy | 7.89 eV |
| Electron Affinity | 0.322 eV |
| Block | D |
Physical Properties
| Appearance | gray blue |
| Standard State | Solid |
| Melting Point | 3290 K (3016.8 °C) |
| Boiling Point | 5731 K (5457.9 °C) |
| Density | 16.4 g/cm³ |
| Molar Heat | 25.36 J/(mol·K) |
| CPK Color | #4DA6FF |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 6 |
| Group | 5 |
| Block | D |
Discovery
| Year Discovered | 1802 |
| Discovered By | Anders Gustaf Ekeberg |
| Electron Shells | 2, 8, 18, 32, 11, 2 |