Technetium electron configuration

Binuclear Technetium Cluster Compounds with the d4-d4 Electronic Configuration of the Core Atoms... 

As expected there is a close resemblance in the chemical behaviour of technetium and rhenium whereas the properties of both elements differ considerably from those of manganese. The electronic configuration of technetium in the ground state is 4d 5s. Technetium is a silver-grey metal which tarnishes slowly in moist air. 

The atom whose ground-state electron configuration is depicted is in the fifth row because it follows krypton. It has the configuration 5s2 4cr, which identifies it as technetium. Alternatively, it has 36 + 7 = 43 electrons and is the element with Z = 43. 

Use the Aufbau principle to obtain the ground-state electron configuration of technetium. 

Additional results for comparing analogous compounds of technetium and rhenium with respect to both reactivity and thermodynamic stability would be desirable, taking into account electron configurations, molecular structures, and strength of bonding and of ligand fields. 

Finally, the energy curves for the Ree cluster confirm the stability of the 24-valence-electron configuration which arises. As with the technetium compound, electron-poor configurations and/or a reduction of symmetry bring no gain in energy. 

Most technetium complexes are redox-active and, because of their low-spin electronic configurations, electron transfer to and from technetium complexes is generally facile [8,9]. Technetium(II) is a particularly accessible oxidation state since it can be readily generated by the oxidation of stable Tc(I) complexes or by the reduction of stable Tc(III) complexes. In vivo reduction of Tc(IU) cations to their neutral Tc(II) counterparts has proven to be an important factor in determining the biological distributions of these cations [10,11]. 

According to the building-up principle, what is the electron configuration of the ground state of the technetium atom (atomic number 43) ... 

Write the electron configurations you would expect for barium and technetium (Z = 43). 

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