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- MODELS OF ATOM"HOW IT ALL BEGAN"By: Joerish Samantha Austero
- At about 400 B.C. Democritus proposed that matter is composed of tiny and uncuttable/hard particles called atomos which are now called atoms.
- Why yes, I am Democritus, and I propose that all matter is composed of tiny and uncuttable/hard particles called "atomos".
- What do you think about atoms?
- 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.
- You see, atoms are tiny solid balls that are indivisible.
- John Dalton also found the Atomic Mass with other chemists and biochemists.
- 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 them into what we know now as electrons.
- Well, I made a model of the atom and I call it the "Plum Pudding" model. The negative electrons represent the raisins in the pudding and the dough contains the positive charge.
- May I ask, What did you do?
- 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 centre of the atom with negatively charged electrons surrounding it.
- Indeed, I discovered that most of the particles went through the gold in the experiment. The atom has a dense center which I call the nucleus.
- Did you discover what nucleus is?
- In 1913, Niels Bohr proposed a theory for the hydrogen atom, based on quantum theory that some physical quantities only take discrete values. Electrons move around a nucleus, but only in prescribed orbits, and If electrons jump to a lower-energy orbit, the difference is sent out as radiation. Bohr’s model explained why atoms only emit light of fixed wavelengths, and later incorporated the theories on light quanta.
- I proposed that electrons are arranged in concentric circular orbits around the nucleus. I created a model that is patterned on the solar system and is known as Bohr's model or the planetary model.
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