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protactinium
Definition
Protactinium is a rare chemical element with the symbol Pa and atomic number 91. It is a silvery-white metal that is radioactive and decays over time. Protactinium is not found in nature, but it can be created in laboratories.
Protactinium is used in some research applications, but it is not used in any commercial products.
How can the word be used?
The discovery of protactinium was a major breakthrough in nuclear chemistry.
Different forms of the word
Noun: a radioactive chemical element with the symbol Pa and atomic number 91.
Adjective: relating to protactinium.
Etymology
The word "protactinium" is derived from the Greek words "protos" (first) and "aktinos" (ray).
The first recorded use of the word "protactinium" was in 1913.
Question
What does Pprotactinium look like?