` Li_(2)CO_(3)` decomposes on heating but the carbonates of other alkali metals do not decompose easily on heating. Why ?

Explanation

Smaller `Li^(+)` ions are unable to stabilize large `CO_(3)^(2 -)` ions. The cations of other alkali metals are large and can stabilize `CO_(3)^(2 -)` ions. This is why `Li_(2)CO_(3)` is less stable as compared to other alkali metal carbonates.