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an element or substance that is not a metal.

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A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.

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

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

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The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configurations, and recurring chemical properties.

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In chemistry and atomic physics, the electron affinity of an atom or molecule is defined as the amount of energy released or spent when an electron is added to a neutral atom or molecule in the gaseous state to form a negative ion.

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in quantum mechanics, an atomic orbital is a mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom.

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The energy spectrum of a system with such discrete energy levels is said to be quantized.

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In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms.

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A metal is a material that is typically hard, opaque, shiny, and has good electrical and thermal conductivity.

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Electron Cloud Model is an informal term in physics. It is used to describe where electrons are when they go around the nucleus of an atom.

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The neutron is a subatomic particle, symbol n or n0 , with no net electric charge and a mass slightly larger than that of a proton.

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A proton is a subatomic particle, symbol p or p+ , with a positive electric charge of +1e elementary charge and mass slightly less than that of a neutron

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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 basic unit of a chemical element.