Definitions
There is 1 meaning of the phrase
Atomic Number 99.
Atomic Number 99 - as a noun
A radioactive transuranic element produced by bombarding plutonium with neutrons
Synonyms (Exact Relations)
eeinsteinium13es2Example Sentences
"The atomic number 99 element is highly radioactive."
"Scientists are still researching the properties of atomic number 99 compounds."
"The atomic number 99 atom has 99 protons."
"The atomic number 99 element can be dangerous if mishandled."
"Researchers are investigating the potential uses of atomic number 99 in medicine."
