This is the first recorded incident about subatomic particles called "electrons".Īnd he introduces the "plum pudding model". Incident of finding of electrons and Plum Pudding ModelĪccordingly that Thomson decided that the Stanger beam which starts from theĬathode consists of or holds a negative charge. Positively charged, they already know this phenomenon. Magnet repulsion is negatively charged and attracts And also when aĬlose magnet is to the cathode ray tube the green color beam reflates oppositely. When applying a high voltage between the cathode and anode he observed a green color beam travel from cathode to anode. He did several experiments by using a Cathode ray tube. When touching the dolomite that rubs our hand, Dyes disperse through water. Furthermore, he said that combining elements with other elements do not change their nature. Type of elements vary from element to element. He said that again matters consist of small particles which are invisible naked eye (Democritus theory). Because of this, Democritus' opinion about atoms was undermined. They say matters can be divided until infinity. Plato and Aristotle's atomic theory (440BC) Absorption of dye dropped on a piece of wood by the wood.Īnd he also said as matter breaks down, it reaches a point where it cannot be further divided.The spread of smoke from a fire through the air.He observed some incidents and they are mentioned below. He said this without any investigation but He said that matter is made up of very fine substances that are invisible to the naked eye. The second thing is ancient Greeks believed that there were four elements that everything was made up of, earth, water, air, and fire. And converted things they called compounds. These main things they called "elements". Of these things converted to other things. Like Au, Fe, S, and Hg because this element is less reactive than others and exist naturally pure stage. And also they found some pure elements (2000BC) Think about how these environmental activities run and what and how these are made. When humans entered the agrarian age, they had plenty of time to carefully think and observe the environment. Hunting era, pastoral age, and agrarian age (3000BC-4000BC) respectively. In the beginning, humankind passed several ages. Background of finding the element, atom and atomic structure
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