Tantalum

Chaitra 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08

Property	Value
Atomic Number	73
Element	Tantalum
Symbol	Ta
Atomic Mass	180.948 u
Number of Neutrons	108 (most common isotope, Tantalum-181)
Number of Protons	73
Number of Electrons	73
Period	6
Group	5
Phase	Solid
Radioactive	No (Ta-180m is a naturally occurring metastable isotope)
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Transition Metal
Atomic Radius	200 pm
Electronegativity	1.50 (Pauling scale)
First Ionization Energy	7.550 eV
Density	16.69 g/cm³
Melting Point	3017 °C
Boiling Point	5458 °C
Number of Isotopes	2 naturally occurring (Ta-181 stable, Ta-180m metastable)
Discoverer	Anders Gustaf Ekeberg
Year	1802
Specific Heat	0.140 J/g·K
Number of Shells	6
Number of Valence Electrons	5