Unit 3: Atoms Vocabulary

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Atom

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The smallest unit of an element that retains the properties of that element

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Subatomic Particle

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Tiny, fundamental units that make up atoms

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Proton

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A positively charged subatomic particle found in the nucleus of an atom

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Neutron

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A neutral subatomic particle found in the nucleus of an atom

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Electron

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A negatively charged subatomic particle that orbits the nucleus of an atom

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Nucleus

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The central core of an atom, containing protons and neutrons

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Electron Cloud

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The region surrounding the nucleus of an atom, where electrons are most likely to be found

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Orbital/Shell

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Fixed pathways or energy levels where electrons are thought to orbit the nucleus

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Periodic Table

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A chart that arranges all known elements based on their properties and atomic structures

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Element

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A fundamental substance that cannot be broken down any further into simpler substances by chemical means