Electronic energies in these elements are measured by differential of quanta, or Dq. These elements’ orbitals are renamed for two gerade (“juh-RAW-duh”) symmetry groups (20[1])when they bond (20[1])along the coordinate axes and separate by (20[1])an energy gap symbolized (20[2])delta. (20[3])One of these elements is the first exception to the Aufbau (20[1]0[1])principle (20[1])because (20[1])it loses (20[1]0[1])a valence (20[3])electron (20[2])at quantum (20[1])number (20[1])n to half-fill the (*) “n minus 1” (10[1])subshell. Visible (10[1])light excites electronic transitions (0[1])in these (10[1]0[1])elements to give their ions color. An 18-electron (0[2])rule replaces the octet rule for these (10[1])elements, (10[1])the first to fill the five “L (0[1])equals 2” orbitals. These elements bond to ligands in coordination complexes. For 10 points, the d-block (0[1])comprises what elements in the center of the periodic (10[2])table? (10[4]0[1])■END■ (10[4])