Question

question 18 of 25 what contribution to atomic theory resulted from albert einsteins work? a. a new model of the atom that described electrons as being in a cloud b. a new understanding that the nucleus contained protons and neutrons c. the discovery that different numbers of neutrons produced isotopes d. a new understanding of what caused some elements to be radioactive

Explanation:

Einstein's work did not contribute to the models in A, B, or C. His work related to the understanding of radioactivity in some elements. For example, his mass - energy equivalence formula $E = mc^{2}$ has implications for nuclear processes including radioactivity.

Answer:

D. A new understanding of what caused some elements to be radioactive