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For this lesson, you will be revisiting what you have learned about the atom, the periodic table, and the Law of Conservation of Mass.
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Now that you’ve reviewed exactly what an atom is, it’s important to know that there are many types of atoms. In fact, there are more than 100 different atoms that have been identified so far. When a bunch of the same kind of atom are combined, it becomes an element.
A Russian chemist named Dmitri Mendeleev made a chart of all of the elements that had been discovered and that he believed would be discovered in 1869. He called this chart the periodic table of elements.
Scientists have learned many things about atoms and elements over the years. An important term that is used when discussing atoms and elements is matter. Matter is defined as anything that has mass and takes up space. Matter is everything around us. Matter makes up atoms.
So, what is mass? Well, mass is the amount of matter in something. Mass is not the same as size, because smaller things can have more mass than larger things. For example, a baseball has more mass than a balloon filled with air even though the balloon is larger.
Let’s Get Started
As you’ve seen in the videos, energy is key. Energy can come in different forms, and it can be very powerful. Now, let’s consider what all of this has to do with power.
For a very long time, there was an accepted belief that atoms could not be broken apart. This all changed in 1938 when two German scientists, Otto Hahn and Fritz Strassmann, split uranium atoms into two or more parts. This discovery generated energy and lead to a revolutionary type of power known as nuclear fission.
Let’s Get to Work
Energy generated from nuclear fission has both benefits and costs, and has become a very controversial topic over the years.
Let’s Wrap Up
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