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| developed the idea that the end point of all division was an atom. This basic matter particle was thought to be indestructible |
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| developed the idea that the end point of all division was an atom. This basic matter particle was thought to be indestructible |
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| He believed that instead of being matter being made of tiny particles (atoms) that they were all fundamentally air, fire, water, and earth |
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| A fundamental piece of matter. (Matter is anything that can be touched physically.) |
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| An electron is a negatively charged subatomic particle |
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| A proton is a subatomic particle with a mass defined as 1 and a charge of +1 (positive charge) |
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| It is the particle in the atomic nucleus with a mass = 1 and charge = 0 |
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