Celebium

Celebium (symbol Cb) is a chemical element, atomic number 113 on the periodic table.

Characteristics and history
Celebium, in its most stable form, has an atomic mass of 299, and was discovered by the Humans for the first time on the planet in the year 2023. This metal is part of the trans-uranic series of heavy elements. 

Celebium is noted for extreme radiation output and toxicity, causing severe damage to many lifeforms, including carbon-based humanoids. A team of Federation scientists on Camus II claimed to have taken casualties from celebium, but Doctor Leonard McCoy examined one ailing survivor and determined their poisoning had come from another source. 

Background
In real-life science, element 113 has yet to be positively discovered. A placeholder name based on its number, "ununtrium", has been suggested to document the possible synthesis of this substance. Some models of theoretical science have stated that heavy elements on this scale cannot exist in nature. Subspace science mentioned in Star Trek may account for the contradiction of this being a deposit on other worlds.