2.2_the atomic structure
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THE STRUCTURE OF THE ATOM
THE STRUCTURE OF THE ATOMTHE ATOMIC [email protected] Historical Development of Atomic ModelJohn DaltonImagined atom as a small, indivisible ball similar to a very tiny [email protected]
JOSEPH JOHN ThomsonDiscovered electronDescribed the atom as a sphere of positive charged which contains a few negatively charged particles called [email protected] Historical Development of Atomic Model
Ernest RutherfordDiscovered proton, a positive charge in an atomThe positive charge and most of the mass of the atom are concentrated in a small, central region called the nucleusThe electron move in a space that is larger than the space occupies by the [email protected] Historical Development of Atomic ModelNeils BohrProposed that the electrons in an atom move in shells around the [email protected] Historical Development of Atomic Model
James ChadwickProved the existence of neutrons, the neutral particles in the nucleusNeutrons contribute approximately to half the mass of an [email protected] Historical Development of Atomic Model
Subatomic Particles of an AtomAtom is made up of three subatomic particles
nisa@smart.chempanelParticleProtonElectronNeutronSymbolpeNRelative Charge+1-10Relative mass1Approximately 0.00051Proton Number and Nucleon NumberProton Number of an element is the number of protons in its atom
Nucleon Number of an element is the total number of protons and neutrons in its atom
[email protected] Number = Proton Number + Number of NeutronSymbol of ElementsElementSymbolElementSymbolElementSymbolElementSymbolHydrogenHCarbonCSodiumNaSulphurSHeliumHeNitrogenNMagnesiumMgChlorineClLithiumLiOxygenOAluminiumAlArgonArBeryliumBeFluorineFSiliconSiPotassiumKBoronBNeonNePhosphorusPCalciumCanisa@smart.chempanel A X ZX : Symbol of elementA : Nucleon NumberZ : Proton Number