Why lithium and magnesium show diagonal relationship

1.	Why lithium and magnesium show diagonal relationship
Answer» The similarity between Li and Mg is because of their similar atomic radii (Li = 152 pm; Mg = 160 pm) and ionic radii. (Li+\xa0= 76 pm, Mg2+ \xa0= 72 pm).These two elements resemble each other in the following properties:(i) Both Li and Mg decompose water very slowly with the liberation of hydrogen.(ii) Both Li and Mg form nitrides - Li directly and Mg on burning in nitrogen.(iii) LiOH and Mg(OH)2 are weak bases.(iv) Nitrates of both decompose on heating to give oxides.\xa0<br>Because there property are match with each other.

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