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Tantalum
Block dPeriod 6Group 5solid at 20 °C
Configuration :[Xe] 4f¹⁴ 5d³ 6s²
Atomic mass :180.94788 u
French :Tantale
3D Bohr-model representation of the Tantalum atom (symbol Ta, atomic number Z=73). Electron shell configuration: 2, 8, 18, 32, 11, 2 electrons.
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Bohr model · educational
Electron configuration
Full[Xe] 4f¹⁴ 5d³ 6s²
Short[Xe] 4f¹⁴ 5d³ 6s²
Valence electrons5
KLMNOPQ shells
K2
L8
M18
N32
O11
P2
Electronegativity
Pauling1.5
Allen—
Mulliken (eV)—
Atomic radii
Empirical145 pm
Calculated200 pm
Covalent170 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+564 pm
Successive ionisation energies
I₁761 kJ/mol
I₂1500 kJ/mol
Electron affinity31 kJ/mol
Oxidation states
-3-10+1+2+3+4+5
Bold states = most common.