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Ions having more hydration energy than Na+
  1. Li+
  2. Be2+
  3. K+
  4. Cs+

Md Sohail Khurshid , 8 Years ago
Grade 12
anser 2 Answers
varun

Last Activity: 8 Years ago

Hello,
Be2+ is the right answer 
because see the below explanation below
The hydration enthalpies of alkali metal ion decreases with increase in ionic sizes
So, the order is Li+>Na+>K+>Rb+>Cs
So hydration enthalpy for Li+ is more
But Be2+ is also there right 
So ionic size for Li+>Be2+
so the size of Be2+ is less so hydration energy for Be2+ is more than Li+
AND WE HAVE ALSO OTHER METGOD TO SOLVE THIS PROBLEM ie
small the size of ion the greater the hydration energy
so BE2+ IS THE ANSWER
please approve me if the answer is correct
THANK YOU
 
somi teez

Last Activity: 8 Years ago

hi,
The extent of hydration of ion decreases with increase in ionic size
. Li+>Na+>K+>Rb+>Cs
and Be + is next to lithium ,
we know,
atomic size decreases across a period
so,
the ionic size of Li+  >  Be +
hence,
Be + has greatest hydration energy among all.
if you go the answer approve it.
 
 
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