| atomic mass u. |
the unit mass equal to 1/12 the mass of the nuclide of carbon-12, equivalent to 1.657 × 10-24 gm. Called also atomic weight u. and dalton.
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| atomic n. |
the number of protons in the nucleus of a nuclide; all the atoms of a chemical element have the same atomic number; sometimes indicated by a subscript preceding the symbol of a chemical element (e.g., 1H).
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| atomic t. |
the theory that the molecules of a substance are made up of one or more atoms, each representing a definite amount of the element, which amount does not vary in the molecule, whatever combinations the molecule may enter.
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| atomic v. |
the value obtained by dividing the atomic weight of an element by its specific gravity in the solid condition.
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| atomic w. |
the sum of the masses of the constituents of an atom, either that of a single isotope or that obtained using weighted averages of the masses of the natural isotopes. It can be expressed in atomic mass units (or daltons), in SI units (i.e., kilograms), or as a dimensionless ratio derived by comparing the mass to the mass of the 12C isotope of carbon, which is defined as exactly 12.000. Abbreviated at wt. Called also atomic mass.
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| atomic | a nonmetallic univalent element belonging to the halogens |
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| atomic | a soft silvery-white tetravalent radioactive metallic element |
| atomic | a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead |
| atomic | a heavy toxic silvery-white radioactive metallic element |
| atomic | a radioactive transuranic metallic element |
| atomic | a radioactive transuranic element that is similar to uranium |
| atomic | a radioactive transuranic metallic element |
| atomic | a radioactive transuranic metallic element |
| atomic | a radioactive transuranic element |
| atomic | a radioactive transuranic element |
| atomic | a radioactive transuranic element produced by bombarding plutonium with neutrons |
| atomic | the branch of physics that studies the internal structure of atomic nuclei |