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Definition of Atomic number 61
1. 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.
Lexicographical Neighbors of Atomic Number 61
Literary usage of Atomic number 61
Below you will find example usage of this term as found in modern and/or classical literature:
1. Within the Atom: A Popular View of Electrons and Quanta by John Mills (1921)
"The first six elements in this new series correspond to the first six in the two
immediately previous series. The seventh, of atomic number 61 ..."
2. Scientific papers of the Bureau of Standards by United States National Bureau of Standards (1922)
"... scheme of the periodic table of elements requires a new element of atomic
number 61 coming between neodymium and samarium.3 Eder * has published similar ..."
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