what is the correct order of thermal stability of group 1 elements?

Alkali metals constitute the 1 group in periodic table.Thermal Stability is the decomposition of a compound on heating.The higher the temperature required to decompose something, the more thermally stable it will be.
In group1,it is found that the thermal stability of hydroxides,carbonates,nitrates sulphates etc.increases down the group.This is because as we move down the group the ionic radius of the cation increases,and its polarising power decreases.In fact group 1 compounds tend to be more thermally stable than group 2 compounds because the cation has a smaller charge and a larger ionic radius,and so a lower polarising powe particularly when adjacent metals on the same period are compared.

Basically stability os inversly prop to covalemt nature which is on turn directly propotional polarizing power .Alkali metals constitute the 1 group in periodic table.Thermal Stability is the decomposition of a compound on heating.The higher the temperature required to decompose something, the more thermally stable it will be.In group1,it is found that the thermal stability of hydroxides,carbonates,nitrates sulphates etc.increases down the group.This is because as we move down the group the ionic radius of the cation increases,and its polarising power decreases.In fact group 1 compounds tend to be more thermally stable than group 2 compounds because the cation has a smaller charge and a larger ionic radius,and so a lower polarising powe particularly when adjacent metals on the same period are compared.

Hello Student


Alkali metals constitute the 1 group in periodic table.
Thermal Stability is the decomposition of a compound on heating.
The higher the temperature required to decompose something, the more thermally stable it will be.
In group1,it is found that the thermal stability of hydroxides,carbonates,nitrates sulphates etc. Generally increases down the group.
This is because as we move down the group the ionic radius of the cation increases,and its polarising power decreases.In fact group 1 compounds tend to be more thermally stable than group 2 compounds because the cation has a smaller charge and a larger ionic radius,and so a lower polarising power particularly when adjacent metals of the same period are compared.

I hope this answer will help you.