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Structure of the Atom (1:55)
Ernest Rutherford conducted an experiment to learn the structure of an atom.
Niels Bohr's Atomic Model (1:24)
According to Bohr’s atomic model, electrons travel only in fixed paths, called energy levels, around the nucleus.
Size of Atoms: Matter (1:04)
Matter is mostly empty space because atoms themselves are mostly empty space.
Atomic Structure: The Nucleus (0:52)
The nucleus contains protons, which are positively charged, and neutrons. Each proton has a mass of about 1 amu.
Atomic Structure: Neutrons (0:33)
The neutron has no electric charge, is found in the nucleus, and has a mass of ~1 amu.
