The L-shell, L-value, or McIlwain L-parameter (after Carl E. McIlwain) is a parameter describing a particular set of planetary magnetic field lines. Colloquially, L-value often describes the set of magnetic field lines which cross the Earth's magnetic equator at …

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In chemistry and atomic physics, an electron shell may be thought of as an orbit that electrons follow around an atom 's nucleus. The closest shell to the nucleus is called the "1 shell" (also called the "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on further and further from the nucleus.

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Shell plc is a British multinational oil and gas company headquartered in London, England. [5] . Shell is a public limited company with a primary listing on the London Stock Exchange (LSE) and secondary listings on Euronext Amsterdam and the New York Stock Exchange.

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The L-shell is one of the electron shells surrounding the nucleus of an atom. It is the second innermost shell, located outside the K-shell, and is responsible for holding the second-highest energy level of electrons within the atom.

NOTE 1 It is also referred as L, and is used as a co-ordinate to describe positions in near-Earth space. NOTE 2 L or L shell has a complicated derivation based on an invariant of the motion of charged particles in the terrestrial magnetic field.

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