(i)"Atom is chemically indivisible." - is this statement correct?

 

tell me how it is corect or how it is wrong?

 

(ii)in my textbook, it says,"atom is divisible in the sense that it has a structure, subatomic particles are known."

 

    don't u think this statement contradicts the first statement.

In Dalton's theory, but usually not discussed is this: atoms can be neither created nor destroyed. An element's atoms do not change into other element's atoms by chemical reactions. For example, nitrogen and oxygen atoms stay as themselves even when combined. They can be recovered by decomposing the substance. As Dalton says:

"We might as well attempt to introduce a new planet into the solar system, or to annihilate one already in existence, as to create or destroy a particle of hydrogen. All the changes we can produce, consist in separating particles that are in a state of cohesion or combination, and joining those that were previously at a distance."

As with most of Dalton's theory, this idea is not original to Dalton. It is Lavoisier who is responsible for the Law of Conservation of Mass in chemical reactions.