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For example, for the thermal decomposition of carbonates of group 2 metals, how does the charge density decreasing down the group affect the rate of this decomposition?

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Increase in charge density increases the polarizing capacity of the atom, decreasing the bond strength, thus facilitating easy decomposition

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    $\begingroup$ timaeus, you should have posted what you did as a new answer, not as an edit to an existing answer. $\endgroup$ – hBy2Py May 5 '16 at 2:41

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