2 12 3 6 4 15 147 What is the electronic configuration of an element in its first excited state which is isoelectronic with O 1

Question

2 12 3 6 4 15 147 What is the electronic configuration of an element in its first excited state which is isoelectronic with O 1 Ne 3s 3p 3d 2 Ne 3s 3p 3 Ne 3s 3p 3d 4 Ne 3s 3p5 148 The quantum number of 20th electron of FeZ 26 would

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