17 relations: Alkali metal, Atomic orbital, Azimuthal quantum number, Carbon, Chemical element, Electron, Electron configuration, Helium, Ion, Molecular orbital, Molecular symmetry, Principal quantum number, Roman numerals, Spectroscopy, Term symbol, Vibronic spectroscopy, X-ray notation.

## Alkali metal

The alkali metals are a group (column) in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K),The symbols Na and K for sodium and potassium are derived from their Latin names, natrium and kalium; these are still the names for the elements in some languages, such as German and Russian.

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## Atomic orbital

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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## Azimuthal quantum number

The azimuthal quantum number is a quantum number for an atomic orbital that determines its orbital angular momentum and describes the shape of the orbital.

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## Carbon

Carbon (from carbo "coal") is a chemical element with symbol C and atomic number 6.

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## Chemical element

A chemical element is a species of atoms having the same number of protons in their atomic nuclei (that is, the same atomic number, or Z).

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## Electron

The electron is a subatomic particle, symbol or, whose electric charge is negative one elementary charge.

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## Electron configuration

In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.

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## Helium

Helium (from lit) is a chemical element with symbol He and atomic number 2.

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## Ion

An ion is an atom or molecule that has a non-zero net electrical charge (its total number of electrons is not equal to its total number of protons).

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## Molecular orbital

In chemistry, a molecular orbital (MO) is a mathematical function describing the wave-like behavior of an electron in a molecule.

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## Molecular symmetry

Molecular symmetry in chemistry describes the symmetry present in molecules and the classification of molecules according to their symmetry.

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## Principal quantum number

In quantum mechanics, the principal quantum number (symbolized n) is one of four quantum numbers which are assigned to all electrons in an atom to describe that electron's state.

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## Roman numerals

The numeric system represented by Roman numerals originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages.

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## Spectroscopy

Spectroscopy is the study of the interaction between matter and electromagnetic radiation.

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## Term symbol

In quantum mechanics, the term symbol is an abbreviated description of the (total) angular momentum quantum numbers in a multi-electron atom (however, even a single electron can be described by a term symbol).

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## Vibronic spectroscopy

Vibronic spectra involve simultaneous changes in the vibrational and electronic energy states of a molecule.

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## X-ray notation

X-ray notation is a method of labeling atomic orbitals that grew out of X-ray science.

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