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Why lithium compounds behave similarly with magnesium compounds but not with other alkali metal compounds?

April 26, 2017alkali Chemistry compounds Lithium Magnesium Mathematics similarly

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Why lithium compounds behave similarly with magnesium compounds but not with other alkali metal compounds?

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They are not that dissimilar from the rest of Gp 1 compounds, but do have some similarities with magnesium compounds because of the similar charge/size ratios of the lithium and magnesium ions. This ‘diagonal relationship’ happens to a greater or lesser extent with quite a few pairs of elements in similar positions. Be/Al, B/Si, C/P.