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Seventeen elements are generally classified as nonmetals most are gases hydrogen helium nitrogen oxygen fluorine neon chlorine argon krypton xenon and radon

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In chemistry a metal is an element that readily forms positive ions cations and has metallic bonds

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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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Chemical compound. A chemical compound is a chemical substance consisting of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition.

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each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter

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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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Electron affinity is defined as the change in energy of neutral atom

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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

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

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

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

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The basic unit of a chemical element