Question

Elements showing diagonal relationship are:

• A. $Li$ and $Be$
• B. $Li$ and $Mg$
• C. $Li$ and $Na$
• D. $Al$ and $Si$

Answer 1

The correct option is B $Li$ and $Mg$

Elements showing diagonal relationship are $Li$ and $Mg$. This diagonal relationship is due to similarity in ionic sizes and charge/ radius ratio of elements. Polarizing power of ions of $L{i}^{+}$ and $M{g}^{2+}$ and electronegativity of $Li$ and $Mg$ are similar.