Who proposed the laws of chemical combination?

In a compound such as water,the ratio of the mass of hydrogen to the mass of oxygen is always

What formed the basis for John Dalton to formulate Dalton's atomic theory?

Name the international organization that approves the names of elements. Give an example with an explanation to show that the Law of Conservation of Mass applies to physical changes as well.

Dalton's atomic theory successfully explained:
$(i)$ Law of conservation of mass
$(ii)$ Law of constant composition
$(iii)$ Law of radioactivity
$(iv)$ Law of multiple proportions

Which postulate of Dalton's atomic theory can explain the law of definite proportions?