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How does the size of an ion affect the hydration radii?

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In a group, ionic radius increases from top to bottom and the hydrated radius decreases from top to bottom. Hydration energy is the amount of energy liberated when an ion gets hydrated that is , it accepts water molecule. e.g. read more

As the size of ion increases its polasiation tendency decreases therefore the tendency to polarise nearby water molecules decreases hence decreasing its hydration radii. This effect can be seen by observing the trend of hydartion radii in alkali metal ions. read more

The second ionisation energy of an element is the energy needed to remove 1 electron from every ion in 1 mole of gaseous +1 ions of an element Define second ionisation energy of an element Energy is needed to overcome the attraction between the outer electrons and the nucleus. read more

For example, the hydration enthalpies of Group 2 ions (like Mg2+) are much higher than those of Group 1 ions (like Na+). The alkali metal ions are highly hydrated. The smaller the size of the ion, the greater is the degree of hydration. Thus, Li+ ion gets much more hydrated than Na+ ion which in turn is more hydrated than K+ion and so on. read more

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