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.
Even when King Saul died, David didn't immediately take his throne. David became king of his own tribe, Judah, while Saul's son Ishbosheth ruled the rest of the nation. Finally, Ishbosheth died, and David was invited to be king of all Israel.here at Hebron, the local leaders of the tribe of Judah agreed to make David their king. The other eleven tribes of Israel, however, followed Saul's right hand man Abner, who made Saul's son Ishbosheth their king. And so Israel was divided for seven and a half years.