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An element or substance that is not a metal.

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An element that readily forms positive ions (cations) and has metallic bonds. Metals are sometimes described as a lattice of positive ions surrounded by a cloud of delocalized electrons.

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An extremely small particle or substance, especially at cellular or structural level, as a biomolecule. (physics and chemistry) The smallest unit of an element or compound, made up of two or more atoms held together by strong chemical bond.

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A material made up of two or more parts or elements. (chemistry) A substance consisting of atoms or ions of two or more elements that are chemically bonded together, e.g. carbon dioxide, a substance consisting of carbon and two oxygen atoms.

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A substance that cannot be decomposed into simpler substances by chemical means, and is made up of atoms all with identical number of protons.

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The Periodic Table is a way of listing the elements. Elements are listed in the table by the structure of their atoms. ... From left to right and top to bottom, the elements are listed in the order of their atomic number, which is the number of protons in each atom.

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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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One of the stable states of constant energy that may be assumed by a physical system —used especially of the quantum states of electrons in atoms and of nuclei — called also energy state.

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A scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. ... The word atom comes from the Ancient Greek adjective atomos, meaning "indivisible".

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The electron cloud is ​the region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital. The region is defined mathematically, describing a region with a high probability of containing electrons.

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An elementary atomic particle that has no charge and a mass that is approximately the same as that of a proton. Neutrons are found in all atoms except the lightest isotopes of hydrogen.

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A proton is a subatomic particle with a positive electric charge. Protons are found in the nucleus of every atom. In fact, the number of protons in each atom is it's atomic number.

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An electron is a negatively charged subatomic particle. It can be either free (not attached to any atom), or bound to the nucleus of an atom. Electrons in atoms exist in spherical shells of various radii, representing energy levels. ... The charge on a single electron is considered as the unit electrical charge.

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the basic unit of a chemical element.