Discovery of the Nucleus: Rutherford's Gold Foil Experiment 

World needs teacher's with his skills of making students understand better.

Rutherford knew very little about alpha particles. He knew they were very small (much smaller than an atom), and he knew they were positively charged. But since he hadn't yet discovered the nucleus, he certainly didn't know that they were actually Helium nuclei!

This was explained way better than a teacher or a textbook. Thank you very much.

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Thanks! You know, Ernest Rutherford was from New Zealand. And you should watch my video called "Why Does Everyone Hate Science?" (it's less than a minute long), because there's a subtle New Zealand shout-out in that!

All great questions! 1) Alpha particles don't actually have to hit a nucleus in order to be moved, because the charges repel 2) If alpha particles were negatively charged, they might stick to the nucleus instead of be repelled by it. 3) I'm sure alpha particles hit electrons, but electrons are so tiny compared to the size of an alpha particle, they don't do anything, it's like a bullet hitting a piece of dust.

Great question! In order to get repelled by the protons, the alpha particles have to get super close to them (almost touching). And since nuclei are so tiny compared to the atom as a whole, it's really easy for the alpha particle to go through empty space in the atom without coming anywhere near the nucleus.

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Niall Horan teaching chemistry. Amazing

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Interesting Nice explanation. I'll share this with my class.

8 years later. Still a legend.

Alpha particles are made of only two protons and two neutrons. They are NOT complete Helium atoms; if you want to be precise, they are only the nucleli of Helium atoms, but they don't have any electrons. The nucleus of an atom is tiny compared to the amount of space that a whole atom with electrons takes up, so it's perfectly fair to call an Alpha particle "much smaller than atom," because it is. It's only a tiny piece of an atom.

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Hey everyone, I'm here to help. If you have any questions or just want to learn more, click on the link in the description above. It'll take you to a page where you can ask me questions.

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The explanation was honestly the best I had about science. It made me understand the whole model and experiment in just 15 minutes, thank you so much.

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It’s so clear and well made, that I don’t have to ask questions to my teacher anymore lol

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the world needs you for 2021

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Tyler I really enjoyed the way that you want to teach us some chemestry discoveries. I am french and actually I think that I have already understood all the points of your lesson. Thank you so much for your work, now it will be esier for me to learn the atomic model of Rutherford

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It's a good teaching methodology making the getting things more effective, correct and effortless. Thanks

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great joke about wrapping gold foil

This video helped me to organize the main points about this experiment in my head, thank you very much!😁

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