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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atoms-elements-and-the-periodic-table/x2613d8165d88df5e:atomic-structure/v/protons-neutrons-and-electrons-in-atoms

Want to explore more? Check out the full Atoms, isotopes, and ions playlist here: https://youtube.com/playlist?list=PLSQl0a2vh4HBSf5CVmr7BQ-DAayIsE71N&si=-2Ff6EXmM07XFU34

Atoms are made up of three types of subatomic particles: protons, neutrons, and electrons. Protons and neutrons are found in the nucleus, the dense region at the center of an atom. Electrons are found outside the nucleus. Protons are positively charged and have a mass of about 1 u. Neutrons are neutral (have no charge) and also have a mass of about 1 u. Electrons are negatively charged and have a much smaller mass of about 0.0005 u.

Sections:
00:00 - Introduction to atoms
00:19 - Atoms as building blocks of matter
00:40 - Structure of the atom
01:08 - Charges of subatomic particles
01:39 - Masses of subatomic particles
02:12 - Atoms make up everything
02:25 - Summary: Subatomic particles in all atoms

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