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Why does the thermal stability of hydroxides alkali earth metals increase down the group?

Why does the thermal stability of hydroxides alkali earth metals increase down the group?

Grade:12

1 Answers

Arun
25750 Points
6 years ago
Thermal stability increases down the group due to the decrease in the charge density of the metal cation. All group 2 metal ions have the same charge (2+) but the smaller ones at the top of the group have it all packed into a smaller space so they polarise the O-H bond more (pull electrons towards the oxygen). This means the O-H bond is already partly broken so it requires less heat to break fully. As you go down the group the O-H is less polarised by the larger group 2 cations with a lower charge density so the thermal stability increases.

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