Question

Which part of Dalton’s theory did Thomson’s findings dispute?

Answer 1

The atom is the smallest known particle of matter.

Answer 2

Dalton believed that atom is indivisible. Atom is the smallest building block of a element.

But Thompson with his plum and pudding model proved that atom is indeed divisible into other subatomic particles. He discovered that negatively charged electrons are embedded as plums in a spherical cloud of positive charge which is akin to a pudding.