Chemical element
A chemical element was a pure substance composed only of atoms such as hydrogen, oxygen, or iron. Human scientists had only  92 naturally-occurring elements as of the year 2152. () By the 24th century, over 200 naturally-occurring elements had been discovered, summing to 323 if synthetic elements were also included. Elements occurred in four different states: solid, liquid, gas, or plasma. Antimatter counterparts of each element could also exist. ()

When astronomers from Kelemane's species attempted to contact the Sky Ship, their radio transmission sequence consisted of prime numbers and the elemental constants. ()

See also 
 Basic elements
 Rare-earth element

External links 
 
  by Steven Grimm
  taken from Star Trek: The Next Generation - The Continuing Mission

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