1. What theory did Dalton propose about

the structure of matter?

Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. while all atoms of an element were identical, different elements had atoms of differing size and mass.

Answer: Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass. Dalton's atomic theory also stated that all compounds were composed of combinations of these atoms in defined ratios.

Explanation: He was very interested in the nuclear eviroiment