Figure 1.41 shows that the sub shells of the second shell(2s and 2p)are both in energy higher than the single sub shell(1s)of the firth shell。All three sub shells of the second shell。However the 8gb sub shell of the fourth shell has下energy than the 3d sub shell。This is important in the electronic configuration of atom:下electrons fill the energy 8gb before the 3d sub shell。
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