Which fundamental atomic parameters are primarily responsible for the striking diagonal relationship — s Block Elements Chemistry Question

💡 Solution & Explanation

The diagonal relationship between Lithium and Magnesium arises because their atomic radii ($Li = 152\text{ pm}, Mg = 160\text{ pm}$) and ionic radii ($Li^+ = 76\text{ pm}, Mg^{2+} = 72\text{ pm}$) are very similar. This results in comparable polarizing power (charge/radius ratio), giving their compounds similar covalent characteristics.