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The final stage of an atom structure was created by Ernest Rutherford with this model

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In 1932 a man by the name James Chadwick discovered neutrons, particles whose mass was close to that of a proton.

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In 1922  Niels  Bohr proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit.

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In 194 H.G.J Moseley discovered that the number of protons in an element determines its atomic number.

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In 1903 another new breakthrough to the atomic structure was Hantaro Nagaoka who proposed an atomic model called the Saturnian Model to describe the structure of an atom.

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In 1869 a man named Dmitiri Mendeleev created the Periodic Table of Elements. Although this is not all the elements, it was a large break through in the scientific community.

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It was not until 2000 years passed in the early 1800s did people begin to question the boundaries of matter again. In 1803 a scientist named John Dalton tested various chemicals that consisted an amount of ´bumpy particles' (atoms) Although he did not know the fundamentals he knew that there was something to be further studied. Which he did and then later made the statement that, "elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements combined together."

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Sadly the question introduced by Democritus was left unchallenged by other philosophers because of a negative review given by Aristotle who believed Democritus' look was worthless.

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In 460 BC a philosopher  named Democritus posed the question: If you break a piece of matter in half, and then break it in half again, how many breaks will you have to make before you can break it no further?

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This is what an atom looks like now, but scientists did not always see it this way.