Trying to get into SCP-writing.
Item #: SCP-673
Object Class: Keter
Special Containment Procedures: SCP-673 is to be contained in a lead sphere two meters in diameter and fifty (50) cm thick, in turn suspended within a vacuum-sealed room with a volume no less than 125 meters cubed. The chamber should be held at temperatures as close to 0 Kelvins as cooling budget will allow in order to slow movement.
Changes in temperature and chemical composition within the chamber should be closely monitored due to the danger of “merged atoms.” Contact between SCP-673 and hydrogen should be avoided at all costs when not testing.
No personnel performing or overseeing tests involving SCP-673 may be closer than 20 m from SCP-673. Tests involving the use of hydrogen with SCP-673 should take place at least 100 m from open air.
Description: SCP-673 is approximately 20 moles (approximately 5.06 kilograms) of element 126 – tentatively referred to as unbihexium – the only known isotope of which contains 126 protons, 126 neutrons, and 126 electrons. SCP-673 is a stable gas at standard temperature and pressure, appearing to have an approximate boiling point of 258 Kelvins.
SCP-673 is classified as Keter due to its ability to spontaneously incur “atom-smashing” between common elements such as carbon, nitrogen, and oxygen. SCP-673 seemingly draws energy from its surroundings to accelerate atoms rapidly enough to “merge” the nuclei, at which point the stored energy is violently released. SCP-673 incites these reactions until an atom of itself is created.
The only reported instance of a human exposed to SCP-673 resulted in the subject's body and the surrounding air becoming entirely converted to SCP-673 within thirty seconds, at which point the resulting buildup of energy [DATA EXPUNGED]. This data indicates that, were SCP-673 exposed to open air, Earth's atmosphere and surface would be composed entirely of SCP-673 within three hours. In the event that SCP-673 reaches the outside environment, it will become necessary to initiate [DATA EXPUNGED] despite massive casualties.
Fortunately, heavy metals pose problematic to SCP-673, due to their high ratio of neutrons to protons. As radioactive SCP-673 has not yet been observed, excess neutrons cannot remain in the nucleus of a “merged atom” created by SCP-673. However, if provided a sufficient repository of hydrogen (the only element without neutrons) – which SCP-673 can store in a process similar to [DATA EXPUNGED] – SCP-673 can convert heavy metals to itself. Therefore, all storage units for SCP-673 must be thoroughly checked for water residue before SCP-673 is added to the chamber.
It should be noted that tests to determine whether SCP-673 is a component in, or has a variant of, SCP-876 are ongoing, but have thus far been inconclusive.
Addendum 673-1: Due to its unusual ratio of protons to neutrons, SCP-673 is not likely to be discovered outside the Foundation, provided the only known sample remains in Foundation custody. However, chemical research facilities are to be closely monitored for any threat of SCP-673 outbreak.
Addendum 673-2: As SCP-673 is not known to naturally decay, and to split the nucleus down to the original component elements risks an atomic explosion, there is as of yet no reliable way to decrease the total amount of SCP-673. Testing that risks increasing the amount of existent SCP-673 should be kept to an absolute minimum.
Addendum 673-3: Current containment sphere for SCP-673 experienced [DATA EXPUNGED]. This incident has been reported as within acceptable bounds to maintain containment of SCP-673; future instances warrant activation of [DATA EXPUNGED].