Could yu please explain how these kind of terms are assigned ?

These are used in CFT\nThe high spin and low spin are the actual quality of a ligand. High spin ligands are low field strength and low spin ligands are of high field strength. T2g...

First of all ground state term is assigned to different d configuration...And after that the total orbital momentum quantum number is spllited according to the degeneracy i.e 2L+1....

You have to check orgal diagram to understand these terms. here group state terms are those which have lowest energy in the orgal diagram for example d1 , d6 in octahedral (HS) and...