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Chem doubts

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cashem'up:
Use of the Data Booklet is relevant to this question.
Which properties would be expected from radium, 88Ra, or its compounds?
1 Radium carbonate decomposes only at a very high temperature.
2 Radium hydroxide is very insoluble.
3 Radium does not react with cold water.

hey guys a doubt the answer to this is only 1 is correct but shouldnt 2 also be correct

Saladin:
Radium hydroxide is soluble, because it is lower down in group 2, and so the bond will not be strong. Genereally, the higher up group 2 u go, the more insoluble stuff gets. Becuase the lower you go the weaker the cation becomes.

Anyways, the reason why 1 is correct is because, the lower down you go the stronger carbonates get, why?? explained here: Thermal stability of carbonates and nitrates

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