Question

the diagram shows a model of an atom. who first proposed this model?
a. rutherford
b. bohr
c. thomson
d. dalton

Explanation:

• Rutherford proposed a nuclear - based atomic model but without defined electron orbits.
• Thomson proposed the "plum - pudding" model.
• Dalton proposed a solid - sphere atomic model.
• Bohr proposed an atomic model with electrons in specific circular orbits around the nucleus, which matches the diagram.

Answer:

B. Bohr