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In this physics chemistry course for the second year, we talk about the periodic classification of chemical elements. We will talk about protons, nucleons and atoms that define this periodic table. ►► Subscribe: http://tinyurl.com/kx99x2n ►►Instagram @MathrixVideos (stories & lives) ►►Snapchat MathrixVideos (stories) ►►Twitter / mathrixvideos ►►Facebook https://www.fb.me/ModeMachine