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Nonmetals are generally brittle (for solid nonmetals), lack lustre, and are insulators.

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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 molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound.

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A compound is a substance formed when two or more chemical elements are chemically bonded together

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

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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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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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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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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, but differ from those of other elements, and unite to form compounds in fixed proportions.

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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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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 of opposite sign.

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A fundamental particle with negative electric charge that is found arranged in quantum mechanical orbits about neutral atoms.

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Atoms is the smallest particle into which an element can be divided without losing its chemical identity.