Krypton ground state electronic configuration, 18 19

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. 

Ground states designated by a" (Kiichle et al. 1994) and i (Ebav et al. 1995) are the most stable electronic states, and their electron configurations in relativistic fuU-electron calculations. [Kr] indicates the electron configuration of krypton... 

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