Ununennium

Ununennium is the temporary systematic name for element 119, a predicted chemical element that has not been experimentally confirmed. It is expected to be an alkali metal in period 8.

Island of stability: A predicted region of enhanced stability among superheavy atomic nuclei. Some models suggest neutron-rich isotopes of element 119 could approach this region.
Nuclear fusion: A reaction in which atomic nuclei combine to form a heavier nucleus. Element 119 could be formed when projectile and target nuclei fuse.
IUPAC systematic element name: A temporary element name formed from numerical roots corresponding to an element’s atomic number. Ununennium encodes the digits of atomic number 119 under this naming system.
Nihonium: The confirmed chemical element with atomic number 113 and symbol Nh. Nihonium is the first confirmed element in period 7, unlike unconfirmed element 119.
Nuclear shell model: A model describing protons and neutrons as occupying quantized energy levels within nuclei. Its predicted shell effects influence estimates of element 119 isotope stability.
Hot fusion: A superheavy-element production method that fuses a relatively light projectile with an actinide target at high excitation. It is an alternative to cold-fusion approaches used in earlier superheavy-element discoveries.
Periodic table: A tabular arrangement of chemical elements ordered by atomic number and recurring properties. Element 119 would occupy the first position in period 8.
Oganesson: The confirmed chemical element with atomic number 118 and symbol Og. Oganesson is the last confirmed element before the predicted element 119.
Superheavy element: An element with atomic number above 103, typically produced in particle accelerators and highly radioactive. Element 119 would extend the known superheavy elements beyond the confirmed periodic table.
Cold fusion (superheavy elements): A superheavy-element production method using medium-mass projectiles and lead or bismuth targets at low excitation. Its established targets cannot readily provide the proton count needed for element 119.

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