(C) The similarity in the chemical properties of $Li$ (Lithium) and $Mg$ (Magnesium) is due to the diagonal relationship between them in the periodic

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(C) The similarity in the chemical properties of $Li$ (Lithium) and $Mg$ (Magnesium) is due to the diagonal relationship between them in the periodic table. Diagonal relationships occur between certain elements of the second and third periods (e.g.,$Li$ and $Mg$,$Be$ and $Al$,$B$ and $Si$) due to similar ionic potential (charge/size ratio).