Chemistry

Elements of the periodic table

Elements of the periodic table


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Ta (tantalum)

Tab. 1
Tantalum
Name of the element:Tantalum
Latin name:Tantalum
English name:Tantalum
French name:Tantalum
Symbol:Ta
Atomic number:73
Condition at 25 ° C:solid, metal
Frequency (in ppm):2
Discovered by:Ekeberg (1802)
Electron configuration:[Xe]4f145d36s2
Oxidation states:+5
Relative atomic mass:180.95
Electronegativity:1.5 (Pauling) 1.33 (Allred)
Atomic radius (in pm):143
Ionization energy (in eVatom-1):7.89
Density (in kgm-3):16654
Melting temperature (in K):3269
Boiling temperature (in K):5698
Tab. 2
Isotopes of tantalum
Mass numberAtomic massFrequency /%Nuclear spin
177*176.94450+72
178*177.94580+1
179*178.94590+72
180*179.94750.012+1
181180.948099.988+72
182*181.95020+3
183*182.95140+72

* Isotope is not stable and decays


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