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?
closed as off-topic by getafix, Klaus-Dieter Warzecha, Wildcat, Todd Minehardt, jerepierre Nov 1 '16 at 15:50
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Increase in charge density increases the polarizing capacity of the atom, decreasing the bond strength, thus facilitating easy decomposition