147 What is the electronic configuration of an element in

Last updated: 7/3/2023

147 What is the electronic configuration of an element in its first excited state which is isoelectronic with O 2 Ne 3s 3p4 1 Ne 3s 3p 3d 4 Ne 3s 3p5 3 Ne 3s 3p 3d 148 The quantum number of 20th electron of r