# 10.7 In what ways lithium shows similarities to magnesium in its chemical behaviour?

Chemical similarities between lithium and magnesium-

1. $Li$ and $Mg$ slowly react with water and their hydroxide and oxides are also less soluble in water. On heating, their hydroxide decomposes. Both the element form nitride $Mg_{3}N_{2}$ and $Li_{3}N$ by direct reaction with nitrogen.
2. $Li_{2}O$ and $MgO$ do not give superoxide on reacting with an excess of oxygen.
3. Lithium and Magnesium carbonates easily decompose into their oxides and carbon dioxide.
4. Chlorides of both element soluble in ethanol.
5. Both chlorides can crystallise from their aqueous solution as hydrates, $LiCl.2H_{2}O$ and $MgCl_{2}.8H_{2}O$

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