| MPN | most probable number |
|---|---|
| NA | Avogadro constant or number; nalidixic acid; Narcotics Anonymous; network administrator; neuraminida... |
| Na | Avogadro number; sodium [Lat. natrium] |
| Nacq | number of acquisitions |
| NCSI | number of combined spherical irradiation |
| atomic number | a radioactive element of the actinide series |
|---|---|
| atomic number | a nonmetallic univalent element belonging to the halogens |
| atomic number | a soft silvery-white tetravalent radioactive metallic element |
| atomic number | a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead |
| atomic number | a heavy toxic silvery-white radioactive metallic element |
| atomic number | a radioactive transuranic metallic element |
| atomic number | a radioactive transuranic element that is similar to uranium |
| atomic number | a radioactive transuranic metallic element |
| atomic number | a radioactive transuranic metallic element |
| atomic number | a radioactive transuranic element |
| atomic number | a radioactive transuranic element |
| atomic number | a radioactive transuranic element produced by bombarding plutonium with neutrons |
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