![]() Table 1 “Properties of the Three Subatomic Particles” summarizes the properties of these three subatomic particles.\), control of individual atoms can be use used create animations. We now know that all atoms of all elements are composed of electrons, protons, and (with one exception) neutrons. The neutron is a subatomic particle with about the same mass as a proton but no charge. The proton is a more massive (but still tiny) subatomic particle with a positive charge, represented as p +. Later, two larger particles were discovered - proton and neutron. It is often represented as e −, with the right superscript showing the negative charge. The first part to be discovered was the electron, a tiny subatomic particle with a negative charge. CHEM 125a - Lecture 20 - Rise of the Atomic Theory (1790-1805) Chapter 1. His famous disciple, Democritus of Abdera, named the building blocks of matter atomos, meaning literally indivisible, about 430 bce. Subatomic ParticlesĪlthough the word atom comes from a Greek word that means “indivisible,” we understand now that atoms themselves are composed of smaller parts called subatomic particles. Leucippus of Miletus (5th century bce) is thought to have originated the atomic philosophy. These concepts form the basis of chemistry.
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