Chromium ground state electronic configuration

Ground-state electronic configuration is ls 2s 2p 3s 3p 3i 4s. Manganese compounds are known to exist in oxidation states ranging from —3 to +7 (Table 2). Both the lower and higher oxidation states are stabilized by complex formation. In its lower valence, manganese resembles its first row neighbors chromium and especially iron ia the Periodic Table. Commercially the most important valances are Mn, Mn ", or Mn ". ... 

Exceptions to predicted configurations You can use the aufbau diagram to write correct ground-state electron configurations for all elements up to and including vanadium, atomic number 23. However, if you were to proceed in this manner, your configurations for chromium, [Ar]4s 3d, and copper, [Ar]4s 3d, would prove to be incorrect. The correct configurations for these two elements are ... 

Chromium (Cr) and copper (Cu) are the first two elements for which the orbital filling order given in expression (8.22) fails to give the correct prediction for the ground-state electron configuration. 

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. 

The "d" block elements "B" Croups (Columns 3-12). the transition metals Characteristically, atoms of these elements in their ground states have electron configurations that are filling d orbitals 17 For example, the first transition series proceeds from Sc(4i33d1) to Zn(4i,23d10). Each of these ten elements stands at the head of a family of congeners (e.g the chromium family, V1B, 6). 

However, as we have already pointed out, the value of Sgg — t2g is quite insensitive to the electronic configuration (2). Therefore, in the present paper, we approximated all of these effective crystal-field splittings by the value of eg — t2g Calculated in the ground state. On the other hand, the Racah parameters represent the electron-electron repulsion interaction and can be calculated by the radial part of the pure 3d atomic orbitals of the impurity chromium ion (1). After evaluating the value of these parameters, the multiplet structure of ruby can be obtained by diagonalizing the Tanabe-Sugemo matrices. 

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