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Elementary Particles (table)
(Encyclopedia)Elementary Particles Leptons Quarks1 Gauge Bosons Some Sample Hadrons For each of these particles, except the photon, gluon, and Z-boson, there is an antiparticle with the same mass and op...Chinese Dynasties (table)
(Encyclopedia)Chinese DynastiesGeologic Timescale (table)
(Encyclopedia)Geologic Timescale 1 Not an era but the time preceding the Cambrian. ...Morse Code (table)
(Encyclopedia)Morse Code International Morse Code American Morse CodeThe American Morse differs in the following symbols: ...Nobel Prizes (table)
(Encyclopedia)Nobel PrizesTrigonometric Functions (table)
(Encyclopedia)Trigonometric FunctionsShakespeare's Plays (table)
(Encyclopedia)Shakespeare's Plays(arranged by approximate date of composition) ...Radio Frequencies (table)
(Encyclopedia)Radio Frequenciesatomic number
(Encyclopedia)atomic number, often represented by the symbol Z, the number of protons in the nucleus of an atom, as well as the number of electrons in the neutral atom. Atoms with the same atomic number make up a c...roentgenium
(Encyclopedia)roentgenium, artificially produced radioactive chemical element; symbol Rg; at. no. 111; mass number of most stable isotope 280; m.p., b.p., sp. gr., and valence unknown. Situated in Group 11 of the p...Browse by Subject
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