the third period a containes only the 8 element even through the electron capacity of third shell is 18
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the third period a containes only the 8 element even through the electron capacity of third shell is 18
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The diagram for the arrangement of electrons in the order of the energy levels is as follows
Here the electrons enter into the 3s shell which can accommodate 2 electrons and then enters into the 3p shell which can accommodate 6 electrons and then it does not the 3d shell, instead it enters the 4s shell.
This is the reason.