what are super heavy elements you mentioned above ?
Superheavy elements, also known as transactinide elements, transactinides, or super-heavy elements, are the chemical elements with atomic numbers greater than 103.
Superheavy element
Superheavy elements, also known as transactinide elements, transactinides, or super-heavy elements, are the chemical elements with atomic numbers greater than 103. 
where are the most massive elements on the periodic table UNANSWERABLE what is the island of stability ? In nuclear physics, the island of stability is a predicted set of isotopes of superheavy elements that may have considerably longer half-lives than known isotopes of these elements. who discovered it ? UNANSWERABLE
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Superheavy element [SEP] Introduction
Superheavy elements, also known as transactinide elements, transactinides, or super-heavy elements, are the chemical elements with atomic numbers greater than 103. The superheavy elements are immediately beyond the actinides in the periodic table; the heaviest actinide is lawrencium (atomic number 103). By definition, superheavy elements are also transuranic elements, i.e. having atomic numbers greater than that of uranium (92). Glenn T. Seaborg first proposed the actinide concept, which led to the acceptance of the actinide series. He also proposed a transactinide series ranging from element 104 to 121 and the superactinide series approximately spanning elements 122 to 153 (although more recent work suggests the end of the superactinide series to occur at element 157 instead).