#ROP-0518Re-order ParagraphsCore & AcademicMedium
Matter Particles
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They knew that atoms contained electrons surrounding a positively charged nucleus. | Physicists of the 1920s thought they had a solid grasp on what made up matter. | Combinations of those two particles made up all of the matter in the universe, it was thought. | They also knew that each nucleus contained a number of protons and positively charged particles. | However, a few years later, a scientist discovered neutron, a third particle unknown before.
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