atoms and elements

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Atom

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The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

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Bond

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A connection between atoms in a molecule, formed by the sharing or transfer of electrons.

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Electron

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A subatomic particle with a negative charge, found in all atoms and acting as the primary carrier of electricity in solids.

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Element

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A substance that cannot be broken down into simpler substances by chemical means, consisting of atoms with the same number of protons.

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Matter

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Anything that has mass and takes up space.

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Molecule

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A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

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Neutron

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A subatomic particle found in the nucleus of an atom, with no electric charge and a mass slightly larger than that of a proton.

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Nucleus

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The positively charged central core of an atom, containing most of its mass and composed of protons and neutrons.

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Periodic Table

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A tabular arrangement of the chemical elements, organized by their atomic number, electron configuration, and recurring chemical properties.

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Proton

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A subatomic particle found in the nucleus of an atom, with a positive electric charge equal in magnitude to that of an electron.