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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 affinityof 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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Orbital Sciences Corporation was an American company specializing in the design, manufacture and launch of small- and medium- class space and rocket systems for commercial, military and other government customers.

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Orbital Sciences Corporation was an American company specializing in the design, manufacture and launch of small- and medium- class space and rocket systems for commercial, military and other government customers.

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Energy levels inside an atom are the specific energiesthat electrons can have when occupying specific orbitals. Electrons can be excited to higher energy levels by absorbing energy from the surroundings. Light is emitted when an electron relaxes from a highenergy state to a lower one.

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In chemistry and physics, atomic theory is a scientifictheory 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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the basic unit of a chemical element.