Question

the first atomic model was presented by j.j. thomson around 1904. see a representation of this model below. this model is different from the one accepted today. why did the model change? new tests provided new evidence for the changes. every time other scientists repeated thomsons experiment the results were different. the old model was never accepted by other scientists. the old hypothesis was thrown away.

Explanation:

Scientific models change as new evidence from experiments and tests emerges. Thomson's plum - pudding model was replaced because subsequent research provided new data about atomic structure.

Answer:

New tests provided new evidence for the changes.