Question

electronic configuration for iron is [Ar]3d6 4s2 then quantum number is for iron 3,2, -2 ,+1/2 but to find quantum numbers we have two methods in another method for iron 4 ,2 ,-2, +1/2 please explain n=3 and 4​ please explain
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Answer 1

Answer:

electronic configuration is best ionisation enthalpy