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An important scientist who contirbuted to our knowledge of the atom was John Dalton. John Dalton lived from 1766-1884. What he did was therorize that atoms are not invisiable but sort of like a jigsaw puzzle with smaller pieces. This is a picture if John Dalton.

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An important experiment that was used to make a breakthrough discoverie was when john dalton expeirmented with his tool to find the atom.the yars these experiments took place was aorun the 19th century. [] The three parts of the atom are electrons, protons, and nuetrons. [] these particles are located inside the necleus. [|http://en.wiki.answers.com/.../What_are_the_three_**particles_that_make**_**up_an_atom**] What makes atoms of elements different from other atoms of other elements are that they still contain the properties of that element.