![]() ![]() If two orbitals have the same value of $ n l, $ they are filled in ascending order of n. We must remember that the orbitals fill in the order of increasing values of $ n l $, where n is the principal quantum number and l is the azimuthal quantum number. It is often referred to as anomalous electron configurations or unusual order of filling of orbitals of a few elements e.g. write the ground-state electron configuration of a europium atom. This tends to half filled d orbitals having greater stability and greater exchange energy. But here 1 electron migrate and 3d5 4s1 is seen experimentally. This is bcoz aufbau principle says that electrons should first b filled in orbitals hving lower energy so Cr should hav 3d4 4s2 configuration. ![]() which symbols in the periodic table represent elements in the noble gas family. 6 years ago Chromium violates aufbau principle. elements that tend to gain electrons easily are called. In all lanthanides, isolated $ 5d $ electrons are transferred to the $ 4f $ subshell, except gadolinium, which will destroy the stability and symmetry of the half-filled f subshell. which electrons account for many of the chemical
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