Question

What scientific discoveries led to changes in Dalton's atomic theory?

Answer 1

The discovery of sub-atomic particles and alimentary particles

Step-by-step explanation:

For over 100 years Dalton's theory was tested and used to explain the chemical and physical behaviour of atoms. But during the 20th century parts of the thoery were found to be incorrect and therefore disproved because atoms are made up of sub-atomic particles and alimentary particles.