Definitions
There is 1 meaning of the phrase
Atomic Number 61.
Atomic Number 61 - as a noun
A soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
Synonyms (Exact Relations)
pmpromethium19Example Sentences
"Promethium, with atomic number 61, is a rare earth metal."
"Electrons orbit the nucleus of an atom with atomic number 61."
"The atomic number 61 indicates the number of protons in a promethium atom."
"Scientists often use the symbol 'Pm' to represent atomic number 61."
"Promethium-147 is the most stable isotope with atomic number 61."
