73
Ta
tantalum
180.95

General properties

Group
group 5
Period
period 6
Category
transition metals
Standard atomic weight
180.947 88(2)
Melting point
3290 K (3017 °C)
Boiling point
5731 K (5458 °C)
Phase at STP
solid

Additional properties

Block
d-block
Electron configuration
[Xe] 4f¹⁴ 5d³ 6s²
Electrons per shell
2, 8, 18, 32, 11, 2
Electronegativity
1.5
Density
16.69 g/cm³
Oxidation states
−3, −1, +1, +2, +3, +4, +5 (a mildly oxide)
CAS Number
7440-25-7