The diagonal relationship is because lithium and magnesium have similar sizes and charge densities, leading to properties like forming nitrides with nitrogen or carbonates that decompose on heating. I memorise this for exams, sitting with my chemistry notes while the *tambari* flowers outside my window stain the pulp a soft yellow. But I think true kinship is not just in periodic tables; it is like my father's old copper pot and my hands—different generations, yet holding the same craft.
#exams#study
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