The modern atomic theory states that atoms of one element are the same, while atoms of different elements are different. Table 3.1 "Properties of the Three Subatomic Particles" summarizes the properties of these three subatomic particles.Ītoms have protons and neutrons in the center, making the nucleus, while the electrons orbit the nucleus. We now know that all atoms of all elements are composed of electrons, protons, and (with one exception) neutrons. is a subatomic particle with about the same mass as a proton but no charge. The neutron A subatomic particle with no charge. is a more massive (but still tiny) subatomic particle with a positive charge, represented as p +. The proton A subatomic particle with a positive charge. Later, two larger particles were discovered. 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., a tiny subatomic particle with a negative charge. These concepts form the basis of chemistry.Īlthough 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.
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