Unbiunium

Unbiunium is the temporary systematic name for the hypothetical chemical element with atomic number 121. No confirmed atom of the element has been produced.

Atomic number: The number of protons in an atomic nucleus, which determines the identity of a chemical element. The number 121 specifies unbiunium’s place among the elements.
Heavy-ion fusion: A nuclear reaction in which two atomic nuclei collide and fuse, sometimes forming a heavier element. Heavy-ion fusion is a principal proposed route to creating unbiunium.
Superheavy element research: Experimental and theoretical work on elements with atomic numbers above 103. Unbiunium is a target of this research, which probes how far nuclei can be extended.
Periodic table, eighth period: The proposed eighth row of the periodic table, which would begin after element 118. Unbiunium would be the third element in the proposed eighth period.
Periodic table: A tabular arrangement of chemical elements ordered by atomic number and recurring chemical properties. Unbiunium would extend the table beyond its currently confirmed elements.
Actinide: An element in the series from actinium through lawrencium, characterized by filling of the 5f electron shell. Actinide targets may be paired with lighter projectiles in attempts to synthesize element 121.
Particle accelerator: A device that uses electromagnetic fields to accelerate charged particles to high energies. Accelerators provide the projectiles used in attempts to synthesize element 121.
IUPAC systematic element name: A temporary element name constructed from the digits of an atomic number using standardized roots and a suffix. Unbiunium follows this naming system until a confirmed discovery receives an official name.
Superheavy element: A chemical element with an atomic number above 103, generally produced artificially and highly unstable. Element 121 belongs to the superheavy region of the periodic table.
Calcium-48: A stable calcium isotope with 20 protons and 28 neutrons, used as a projectile in superheavy-element research. Its neutron-rich nucleus has enabled synthesis of several known superheavy elements.

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