Multiple Choice
In atomic theory, the electron cloud model describes electrons as existing in regions of probability rather than fixed orbits. Who is most closely associated with developing this electron cloud (quantum mechanical) model?
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4. Atoms and Elements
Atomic Theory
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In the development of atomic theory and the discovery of new elements, who first identified the element radium?
A
J. J. Thomson
B
Marie Curie and Pierre Curie
C
Dmitri Mendeleev
D
Ernest Rutherford
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