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The basic unit of a chemical element.

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the fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.

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defined as the change in energy

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the group of electrons revolving around the nucleus of an atom; a cloud like group of electrons

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an element or substance that is not a metal.

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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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a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity

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

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the theory that all matter is made up of tiny indivisible particles (atoms). According to the modern version, the

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a thing that is composed of two or more separate elements; a mixture.

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a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

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a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.

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a part or aspect of something abstract, especially one that is essential or characteristic

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each of the actual or potential patterns of electron density that may be formed in an atom or molecule by one or more electrons, and that can be represented as a wave function.

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a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.