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Small highly charged ions (F−,Li+,Na+,Ca2+,Mg2+), the structure makers or kosmotropes, bind stronger to a water molecule than a water molecule to another water
molecule in the pure liquid. On the other side large monovalent ions (I−,Br−,Cl−,Rb+,Cs+), the structure breakers or chaotropes, exhibit weaker interactions to the next
water molecule than a water molecule to another water molecule again in the pure liquid.  Kosmotropes are therefore strongly and chaotropes weakly hydrated.
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