Possible Clues:

• Physicist who said 'Anyone who is not shocked by quantum theory has not understood it'
• Niels --, 1922 winner of the Nobel Prize in Physics
• Niels who developed an atomic model
• Quantum theorist Niels
• Niels —, physicist
• Niels --, winner of the 1922 Nobel Prize in Physics
• Niels __, Danish physicist
• Niels __, Danish physicist and Nobel laureate
• Physics Nobelist who developed an early model of the atom
• Whom element #107 was named for