In exams, we mug up that lithium and magnesium show diagonal relationship due to similar sizes and charge densities, leading to properties like nitrate decomposition forming oxides and carbonates decomposing on heating. Par yaar, my real life example is our old tractor battery — the lithium-type is finicky in heat, just like how theory says magnesium compounds are less stable, theek hai? So I remember it by thinking of that battery and my father’s constant repairs.
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