Ta
Tantalum
Z 73 180.948 g/molTransition Metal
Nucleus
73 Protons
108 Neutrons
73 Electrons (5 Valence)
Shell distribution: K2 • L8 • M18 • N32 • O11 • P2 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Xe]4f145d36s2
Radii
Empirical
145 pm1.45 Å
Calculated
200 pm2 Å
Covalent
170±8 pm1.7±0.08 Å
van Der Waals
217 pm2.17 Å
Oxidation States
CommonRare
-3
-1
0
0
+1
+2
+3
+4
+5
Crystal Structure
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Body-centred Cubic