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Definition of "NA" |
Nanoampere(s) / Namibia, North America(n), Not Applicable, Sodium, North American Airlines, Naturally Aspirated, Nigerian Army, North Allegheny School District, National Amusements, Nanoampere(s), nation assistance / Sodium is a chemical element with symbol Na and atomic number 11. It is a soft, silver-white, highly reactive metal and is a member of the alkali metals; its only stable isotope is ²³Na. / See numerical aperture. |
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