Selenium ground state electronic configuration

The cyanate ion has the ground-state electronic configuration lu , 2a, 3o , 4a, 6o, 6u , Itt the thiocyanate and subsequent ions are similar unless account is taken of the core electrons or empty d orbitals of sulfur, selenium, or tellurium which increase the complexity of the ground-state description. The most sophisticated calculations that have been carried out on these ions are those of McLean and Yoshimine 506) on NCO" and NCS . The calculated orbital energies are given in Table... 

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

What is the expected ground-state electron configuration for each of the following elements (a) tellurium (b) cesium (c) selenium (d) platinum (e) osmium (f) chromium. 

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