Alpha Scattering

    Cards (19)

    • What did ancient Greeks believe about atoms?
      Everything is made of indivisible tiny spheres
    • What was discovered about atoms in 1897?
      Atoms contain tiny negative particles called electrons
    • How did the discovery of electrons change the atomic model?
      It showed atoms have an internal structure
    • What is the plum pudding model of atomic structure?
      A ball of positive charge with embedded electrons
    • What was the purpose of the alpha scattering experiment?
      To test the validity of the plum pudding model
    • What material was used in the alpha scattering experiment?
      Gold foil
    • Why was gold chosen for the experiment?
      It can be hammered into very thin foil
    • What are alpha particles?
      Positive charged particles used in experiments
    • What did scientists observe about most alpha particles in the experiment?
      They passed straight through the gold foil
    • What did the deflection of some alpha particles indicate?
      The center of the atom has a positive charge
    • What conclusion was drawn from alpha particles bouncing back?
      The mass of the atom is concentrated in the nucleus
    • What is the central part of an atom called?
      Nucleus
    • What did scientists replace the plum pudding model with?
      The nuclear model of atomic structure
    • Who proposed that electrons orbit the nucleus at specific distances?
      Neil Bohr
    • What are the orbits of electrons around the nucleus called?
      Energy levels or shells
    • What particles were discovered in the nucleus years later?
      Protons and neutrons
    • What charge do neutrons have?
      They are neutral
    • What are the key developments in atomic structure from ancient Greece to modern science?
      • Ancient Greeks: Atoms as indivisible spheres
      • 1897: Discovery of electrons
      • Plum pudding model: Positive charge with embedded electrons
      • Alpha scattering experiment: Revealed nucleus and empty space
      • Nuclear model: Nucleus with protons and neutrons
      • Bohr's model: Electrons in specific energy levels
    • What are the main components of the nuclear model of the atom?
      • Nucleus: Contains protons and neutrons
      • Electrons: Orbit the nucleus in energy levels
      • Mostly empty space in the atom
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