Why is element 118 no longer on the table?

Answer 1

The rules for how many nucleons can be put together in a nucleus are complicated, but basically they predict that as you pack more and more nucleons in past Ni-62, the nucleus gets less and less stable. By the time you reach atomic number 93 and 209 nucleons, there are no more (known) stable isotopes, and it gets harder and harder to synthesize these unstable nuclei.

Theory predicts that there might be a "magic island" of stability, but it's difficult to reach. In particular, it's thought that there might potentially be relatively stable nuclei with atomic numbers 114, 120, and 124. (the most stable isotope of 114 that we know of has a half-life of about 3 seconds, but we haven't managed to pack enough neutrons into it to reach the hypothetical island of stability yet).

Answer 2

Element 118 was temporarily on the Periodic Table but has since been removed because its existence and properties have not been sufficiently confirmed by the scientific community. It was an artificially created element that only exists for a very short period of time before decaying into other elements.

Answer 3

The element 118 - ununoctium (Uuo)is on the Mendeleev periodic table. Today this element is not homologated by IUPAC.

Answer 4

Being simplistic: Each atom for that element can be identified by the number of electrons. So it it has one electron, it is hydrogen.

Answer 5

there is only 92 elements because those are the only ones know but they left space for more elements if found