Atomic number
The quest for new elements is usually described using atomic numbers.
As of 2026, all elements with atomic numbers 1 to 118 have been observed.
The most recent element discovered was number 117 (tennessine) in 2009.
Synthesis of new elements is accomplished by bombarding target atoms of heavy elements with ions, such that the sum of the atomic numbers of the target and ion elements equals the atomic number of the element being created.
In the context of superheavy elements (Z = 104), the half-[19] life of a nuclide becomes shorter as atomic number increases, though undiscovered nuclides with certain "magic " numbers of protons and neutrons may have relatively longer half-lives and comprise an [20] island of stability.
A hypothetical element composed only of neutrons, neutronium has also been proposed and would have [21] atomic number 0, but has never been observed.
SEE PDFs for complete article from Wikipedia.
MY NOTES FROM WIKIPEDIA ATOMIC NUMBER ARTICLE:
“Synthesis of new elements is accomplished by bombardingtarget atoms of heavy elements with ions, such that the sum of the atomic numbers of the target and ion elements equals the atomic number of the element being created.”
rk NOTE: How do the SCIENTISTS BOMBARD target atoms and what happens when THEY DO?
“The quest for new elements is usually described using atomic numbers.”
“As of 2026, all elements with atomic numbers 1 to 118 have been observed.”
rk NOTE: How do you “observe” an element?
“The most recent element discovered was number 117 (tennessine) in 2009.”
“Synthesis of new elements is accomplished by bombarding target atoms of heavy elements with ions, such that the sum of the atomic numbers of the target and ion elements equals the atomic number of the element being created.”
rk NOTE: How do the SCIENTISTS BOMBARD target atoms and what happens when THEY DO?
“In the context of super heavy elements (Z = 104), the half-[19] life of a nuclide becomes shorter as atomic number increases, though undiscovered nuclides with certain "magic " numbers of protons and neutrons may have relatively longer half-lives and comprise an [20] island of stability.”
rk NOTE: What is a “super heavy” element? What are the “MAGIC NUMBERS” AND how do you know about them if they are “undiscovered”?
“A hypothetical element composed only of neutrons, neutronium has also been proposedand would have [21] atomic number 0, but has never been observed.”
rk NOTE: CITATION NEEDED!
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