Atoms of different elements with the same number of of shells are placed in the same period . Na, Mg, Al, Si, P, S,Cl,and Ar belongs to the third period of the modern periodic table, since the electrons in the atoms of these elements are filled in K,L,and M shells. Draw the electronic configuration diagram of these elements and confirm the above statement.
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Or we can say that atoms of different elements with the same number of occupied shells are placed in the same period. Na, Mg, Al, Si, P, S, Cl and Ar belong to the third period of the Modern Periodic Table, since the electrons in the atoms of these elements are filled in K, L and M shells.
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Or we can say that atoms of different elements with the same number of occupied shells are placed in the same period. Na, Mg, Al, Si, P, S, Cl and Ar belong to the third period of the Modern Periodic Table, since the electrons in the atoms of these elements are filled in K, L and M shells.
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