`Na_(2)CO_(3)` does not decompose on heating whereas `CaCO_(3)` decomposes . Why ?

AgNO_(3) does not decompose where :

Does Na_(2)CO_(3) decompose on heating?

Why does Li_2CO_3 decompose at a much lower temperature whereas Na_2CO_3 decomposes at a much higher temperature?

Li_2CO_3 decomposes on heating to give CO_2 but Na_2CO_3 does not decompose .Explain why?

Why is Li_(2)CO_(3) , decomposed at a lower temperature, whereas Na_(2)CO_(3) , at higher temperature?

Name : a carbonate which does not decompose on heating.

Why is Li_(2)CO_(3) decomposed at a lower temperature whereas Na_(2)CO_(3) at higher temperature?