Question

Could an orange or a lemon, which also contain seeds inside soft pulp, be a good comparison? In what ways does it match Thomson's idea and where does it fall short?

Answer 1

Yes, an orange or a lemon is a useful comparison. The soft pulp represents the positive charge, and the seeds represent the negatively charged electrons spread throughout it, so the whole fruit is neutral, just as Thomson's atom is. However, the comparison falls short because the seeds in a fruit are fixed in one place and are not moving around, and the fruit cannot explain the large deflections of alpha particles seen in the gold foil experiment. The analogy helps visualise the model but has clear limits.