Wat group of elements from which it is hardest to remove the outermost electron is wat group?

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

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What essay do you want us to write?

The total number of nucleons