Transcription of Chapter 1 - Basic Concepts - atoms
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Chapter 1 - Basic Concepts - atoms
1 Chapter 1 - Basic Concepts : atomsDiscovery of atomic structureJJ Thomson (1897) Milliken (1909)Rutherford (1910)Rutherford (1911)2 Symbol p+ e-n0 Mass (amu) 1919, Rutherford 1897, Thomson 1932, ChadwickAtomic and Mass Numbers126 CSymbolMass numberAtomic number (optional)Atomic number (Z): equal to the number of protons in the nucleus. All atoms of the same element have the same number of protons. Mass number (A): equal to the sum of the number of protons and neutrons for an mass unit (amu) is 1/12 the mass of 12C ( 10-27kg)AZE3 Isotopes of HydrogenHydrogen1 proton1 electronDeuterium1 proton1 neutron1 electronTritium1 proton2 neutrons1 electron+++The atomic massis the weighted average mass, of the naturally occurring element.
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