how did find the atom?

               All of student can`t learn well specially science like chemistry or physics or maths.Why?There is some problems in our learning way.We must not going to commit to memory when are we learning.We must understand what we learn.Then we can understand any difficult lesson easily.Also when we are going to learn chemistry we must understand what we learnt because chemistry is built by lot of assumptions.We can`t see atoms,molecular....like that.
              So we learn how did people find the atom?.How did people get some idea about a atom?.Now i`m going to tell you .How did people get some idea about a atom?

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