The island of stability refers to the as of now, undiscovered (or created) elements that have stable qualities. As for the sea, im not sure, sorry.

The "island of stability" comes from the shape the heavier elements projected stability makes on a 3D graph. See links below.

The general trend of the elements is that as they get heavier (atomic number) stability decreases, but scientists have found that some elements will become more stable if they have a "magic number" of protons and neutrons. The island of stability is the more stable heavy isotopes because of the "magic numbers". Some think the number of neutrons and protons leads to a spherical-shaped nuclei, which leads to stability.

You could rule an island by being the richest person on the island. You could then give gifts and stability to the people living on the island, making them grateful to you.

It brings more economic and political stability to the region "Study Island" Blue :)

Government would intervene in the economy if the private sector could not guarantee stability.

Have fun on study island..