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Democritus 400 B.C The discovery of Atmos meaning indivisible. He found this by taking a seashell and break it in half the he took half and broke it in half over and over again till he finally left with a fine powder.

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He was the first that discovered atoms. He also found that "air is not an elementary substance, but a composition," or mixture of gases". By finding this out he invented a oxygen isolating apparatus. He used oxygen by melting mercury oxide with burning glass.

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Dalton proposed that every single atom of an element, such as gold, is the same as every other atom of that element. He also noted that the atoms of one element differ from the atoms of all other elements. Today, we still know this to be mostly true. Dalton discovered that oxygen combined with either one or two volumes of nitric oxide in closed vessels over water and this pioneering observation of integral multiple proportions provided important experimental evidence for his incipient atomic ideas

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Max Planck assisted the Atomic Theory with his discovery of "Quantum of Action". To make this discovery, Max used old and fashionable methods such as equations. This was a pretty big change to the atomic theory due to the fact that this was also the start of the Quantum Theory. He was the one to create and invent the 'Plancks Constant' this gives the relationship between the energy of a photon and its frequency

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John Dalton stated that all matter was created by atoms. He also defined elements as matter that could not be broken down, like gold, iron, ect. John Dalton did not use a specific machine or setup, but observed how water could exist in many different forms, like Ice, Water, and Steam, but didnt scientificly change. Impressivley, John's definition of the elements helped create the periodic table that we reference today.

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The Cathode Ray was used by JJ Thomson on 1897. Thomson had discovered the electron which then went on to purpose a model for the structure of the Atom. And all the atoms contain tiny negatively charged subatomic particles on electron. Thomson placed two oppositely-charged electric plates around the cathode ray. The cathode ray was deflected away from the negatively-charged electric plate and towards the positively-charged plate. This indicated that the cathode ray was composed of negatively-charged particles.

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He used an x-ray to observe and measure various chemical elements using diffraction in crystals. He uses a lot of self-built equipment. His discovery was only a milestone in advancing what people already knew of atoms.

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In 1913, Neils Bohr, made the Bohr Model. He made it by studying how hot hydrogen gives off light. He recorded the wave lengths of the light. He discovery helped the understanding of the atoms substantially.

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he discovered the existence of neutral partials.

he used the neutron chamber- inside the detector, particles from a radioactive source hit a beryllium target. from the force of this impact, neutrons were given off, and could only be detected when they dislodged protons from a piece of paraffin wax. (1932)
it changed our understanding. scientist started to realize that the newly discovered neutron, as an uncharged but fairly massive particle (could be used)

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she founded the term fission she made uranium atoms split and it relisd a larg amout of enenergy  she made xray equipment it worked casing nucler fisson wicherled she gaue the info that let us split atomos