Because attraction of water molecules around an ion depends on. that ion's density of charge, smaller ions (and thus ions of greater ionic. potenti. al) attract more water molecules. The result is the. inverse. relationship. between non-hydrated radius and hydrated radius shown below.
[v. 5] In Hebron he reigned over Judah seven years and six months: and in Jerusalem he reigned thirty and three years over all Israel and Judah.   This would have made David 37 when he became king of all Israel. Do not get confused between 'Judah' and 'Israel': they are not the same.
At the time God said this to Saul through Samuel, David was only a boy of 8 to 12 years old. God knew that though David was young, he would grow up to be a man in tune with Godâs heart and plan for Israel. David wrote many of the Psalms that we cherish.