Question

Why does thermal stability of carbonates of group2 increase down the group?

Answer 1

For carbonates and bicarbonates, I know that stability increases down the group, and for chlorides and fluorides, stability decreases down the group.

Answer 2

Answer:

The positive ion attracts the delocalised electrons in the carbonate ion towards itself. The carbonate ion becomes polarised. If this is heated, the carbon dioxide breaks free to leave the metal oxide.. In other words, as you go down the Group, the carbonates become more thermally stable.