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In chemistry, a nonmetal is a chemical element that mostly lacks metallic attributes. Physically, nonmetals tend to be highly volatile, have low elasticity, and are good insulators of heat and electricity

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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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A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge

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

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A chemical element is a species of atoms having the same number of protons in their atomic nuclei. 118 elements are identified, of which the first 94 occur naturally on Earth with the remaining 24 being synthetic elements

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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. In chemistry and atomic physics, an electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus.

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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. ... The word atom comes from the Ancient Greek adjective atomos, meaning "indivisible".

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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 neutron is a subatomic particle, symbol n or n0 , with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons constitute the nuclei of atoms

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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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The electron is a subatomic particle, symbol e− or β− , with a negative elementary electric charge.

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Atom is a free and open-source text and source code editor for macOS, Linux, and Microsoft Windows with support for plug-ins written in Node.js, and embedded Git Control, developed by GitHub