- - namesake of a physics institute at the university of copenhagen
- - Niels ..., quantum physics pioneer
- - Niels ..., Danish scientist who won the Nobel Prize in Physics in 1922
- - Neils .., winner of the 1922 Nobel Prize for physics
- - Niels ..., 1922 Physics Nobelist
- - Atom modeler Niels
- - Danish Nobel Prize-winning physicist
- - Nuclear Nobelist
- - Niels who won the Nobel Prize for his model of the atom
- - Physics Nobelist who developed an early model of the atom
- - Physicist Niels
- - Niels --, winner of the 1922 Nobel Prize in Physics
- - Niels —, physicist
- - Niels with a Nobel
- - Physics Nobelist the year after Einstein
- - Nobelist from Copenhagen
- - Niels --, 1922 winner of the Nobel Prize in Physics
- - Niels who developed an atomic model
- - Physics Nobelist Niels
- - Quantum theorist Niels
- - 1922 physics Nobelist Niels
- - Nobel physicist Niels
- - Nobelist Niels
- - Danish physicist
- - Nuclear Nobelist Niels
- - Nobelist who developed a model for 63-Down
- - Niels who modeled the atom
- - 1922 Physics Nobelist
- - Danish physics Nobelist
- - Surname of father-son physics Nobelists
- - Danish physicist Niels
- - Niels famous for studying the atom
- - Physics Nobel Prize winner
- - Nobel scientist Niels
- - Atomic physicist Niels
- - Nuclear physicist Niels
- - Famous physicist Niels
- - Niels of physics fame
- - Nobel-winning physicist Niels
- - Atom studier Niels
- - Physicist Niels of atomic theory
- - Nobelist name of 1922 and 1975
- - Danish Nobelist
- - Father or son physics Nobelist
- - Danish Nobelist Niels
- - Nuclear Niels
- - Quantum physicist Niels
- - 1922 Nobelist Niels
- - Niels or Aage of physics
- - Physics Nobelist the year after Einstein won
- - Danish physics Nobelist Niels
- - Nobelist at Los Alamos
- - 1922 Nobelist in physics
- - Nuclear theorist Niels
- - 1922 Danish Nobelist
- - Nobel-winning physicist Niels or Aage
- - Danish nuclear physicist
- - Danish physicist of note
- - 1922 Physics Nobelist ... or his son, 1975 Physics Nobelist
- - Danish Nobel Prize winner
- - Danish nobelist in physics
- - Physics Nobelist Nils
- - Danish atomic physicist
- - Nobelist in Physics: 1922
- - Physics Nobelist: 1922
- - Eminent Danish physicist
- - Danish Nobelist, 1922
- - Famous Danish physicist.
- - Danish physicist, Nobel Prize winner, 1922.
- - Theory in physics.
- - Great name in physics.
- - Quantum physics pioneer
- - Physicist Niels who won a Nobel Prize in 1922
- - Pioneer in atomic theory
- - Physicist, heating element up, runs
- - A physicist, he died after backing human rights
- - "Copenhagen" scientist
- - Atomic physicist
- - Quantum theory pioneer
- - Whom element #107 was named for
- - Physicist who said 'Anyone who is not shocked by quantum theory has not understood it'
- - Scientist passing oxygen and hydrogen through bromine
- - Atomic theory pioneer
- - To whom Einstein wrote, "Not often in life has a human being caused me such joy by his mere presence as you did"
- - 1920s-'30s debate opponent of Einstein
- - Planck contemporary
- - Atom modeler
- - Physicist represented in the play "Copenhagen"
- - Either of two Nobel-winning physicists
- - Einstein contemporary
- - Physicist with an element named after him
- - He made a model of the 55-Down
- - Noted Los Alamos scientist
- - Pioneer in quantum theory
- - Nobel physicist in 1922 or 1975
- - Nobel physicist: 1922
- - Nobel Prize physicist: 1922
- - Physicist, winner of first Atoms for Peace Award.
- - Nuclear physicist.
- - Manhattan Project scientist
- - Los Alamos scientist
- - Nobel physicist
- - See 10 Across
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- [ Other definitions ]