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Physical Science
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  • In the year 1897, JJ Thomson found out that there are negatively charged particles inside the atom. Thomson named these negatively charged particles corpuscles, but scientists later changed it into what we know now as electrons.
  • At about 400 B.C. Democritus proposed that matter is composed of tiny and uncuttable/hard particles called atomos which are now called atoms.
  • In the year 1910, Ernest Rutherford The Nucleus and the protons inside the Nucleus through the gold foil experiment. In 1911, he also proved Thomson's PLum Pudding wrong. Rutherford concluded that the atom consisted of a small, dense, positively charged nucleus in the center of the atom with negatively charged electrons surrounding it.
  • In the year 1869, Dmitri Mendeleev created the periodic table. He created it with the Mendeleev Theory. Dmitri Mendeleev's Theory was arranging the 63 elements based on atomic mass into a periodic table.
  • In the year 1808, John Dalton created the first atomic theory. His theory was that matter was made up of atoms that are indivisible and indestructible.
  • John Dalton also found the Atomic Mass with other chemists and biochemists.
  • I made a model of the atom and I call it the "Plum Pudding" model. The negitive electrons represent the raisins in the pudding and the dough contains the positive charge.
  • Hello, I am Democritus, and I propose that all matter is composed of tiny and uncuttable/hard particles called "atomos". 
  • Atoms are tiny solid balls that are indivisible.
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