Labels:bulletin board | earth | person | reckoner | sky OCR: Atoms are composed of three types of subatomi particles: pro tons neutrons and electrons these only electrons are truly fund amental not composed D smaller particles). Protons and neutrons are both made up smaller building blc ks of the subatomic universe known quarks. T here are six different types of quarks, and each has antiparticle or antiquark. Combinati ions of two or three quarks and or antiquarks make up larger particl es, called had rons There are two maincategories of had rors: baryons and mesons. Baryons inc lude pro tors and neu trons, and are made up of three component quarks. Mesons are short -lived particles, com prising quark and ar antiquark. pasod esons
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