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(chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium actinide series
any of a series of radioactive elements with atomic numbers 89 through 103 actinide , actinoid , actinon
energy that an atomic system must acquire before a process (such as an emission or reaction) can occur activation energy , energy of activation
former executive agency (from 1946 to 1974) that was responsible for research into atomic energy and its peacetime uses in the United States AEC , Atomic Energy Commission
radioactive decay of an atomic nucleus that is accompanied by the emission of an alpha particle alpha decay
atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule ammonia clock
bomb working off fission of heavy atomic nuclei atomic bomb , fission bomb
explosion of an atomic bomb atomic explosion , nuclear explosion
(chemistry) the mass (in atomic mass units) of an isotope of an element atomic mass
branch of physics that studies the internal structure of atomic nuclei atomic physics , nuclear physics , nucleonics
(chemistry) the ratio of the atomic mass of an element to half the atomic mass of carbon atomic weight , relative atomic mass
Canadian physicist who bounced neutron beams off of atomic nuclei to study the structure of matter (1918-2003) Bertram Brockhouse , Brockhouse
Swedish chemist who discovered three new elements and determined the atomic weights of many others (1779-1848) Berzelius , Jons Jakob Berzelius
radioactive decay of an atomic nucleus that is accompanied by the emission of a beta particle beta decay
atomic accelerator betatron
(physics) a theory of atomic structure that combined Rutherford's model with the quantum theory; electrons orbiting a nucleus can only be in certain stationary energy states and light is emitted when electrons jump from one energy state to another Bohr theory
Danish physicist who studied atomic structure and radiations; the Bohr theory of the atom accounted for the spectrum of hydrogen (1885-1962) Bohr , Niels Bohr , Niels Henrik David Bohr
atomic clock based on the energy difference between two states of the caesium nucleus in a magnetic field caesium clock
any process in which an atomic or nuclear system acquires an additional particle capture
atomic clock that defines the second cesium atomic clock
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