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How do you picture an atom in your mind like this, or like this, or maybe one of these? If you understand enough about atoms to visualize any of those things, then you know more about atomic theory than scientists did just 100 years ago. And, like, WAY more than they thought they knew 2500 years ago. That's when Greek philosopher Lucius and his pupil Democritus first came up with the idea that matter is composed of tiny particles. No one knows how they developed this concept, but they didn't#39’t think the particles were particularly special they just thought that if you cut something in half enough times, eventually you'll reach a particle that can#39’t be cut anymore. They gave these particles the name quot;atoms,” which means uncuttable or indivisible. So basically, they thought that iron was made up of iron particle sand clay was made up of clay particles and cheese was made up of cheese particles. And they attributed properties of each substance to the forms of the atoms. So, they thought that iron atoms were hard and stuck together with hooks, clay atoms were softer and attached by ball and socket joints that made them flexible, and cheese atoms were squishy and delicious. Now this makes a certain amount of sense if you're done#39’t happen to have access to electron microscopes or cathode-ray tubes or the work of generations of previous scientists. Because the fact is atomic theory as we know it today is the product of hundreds, if not thousands, of different insights. Some models, like that of Lucius, were just blind guesses. As time went on, many more were the result of rigorous experimentation. But, as has been the case in all science, each scientist built on what had been learned before. We've been talking a lot about the fine details of chemistry in recent weeks, and we're going to keep doing that as we move on to nuclear chemistry and then to the basics of organic chemistry, but we do, I wanted to set aside some time to explain how we know what we know about the atom today, and how we know that we're not quite done figuring it out. Theme Music Now you might think that once Lucius and Democritus came up with the general idea of atoms, it'd be pretty easy for someone else to take that little, indivisible ball and run with it. But you'd be wrong. The next major developments in atomic theory didn't#39’t come along for nearly 2300 YEARS. IN#39’ve already told you, for instance, about the French chemist Antoine Lavoisier, who proposed the law of conservation of mass, which states that even if matter changes shape or form, its mass stays the same. And you should remember the English teacher James Dalton who determined that elements exist as discreet packets of matter. Thanks to these, and other great minds, by the 1800s we had a better grip on the general behavior of atoms. The next logical question was “Why? Why do they behave the way they do?quot;This led to the investigation of atomic structure. In the 1870s, scientists began probing...
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