Presentation on theme: "The Early Models of the Atom"— Presentation transcript:
1 The Early Models of the Atom I. Structure of the AtomThe Early Models of the Atom
2 Laws Law of Conservation of Mass Law of Definite /Constant Proportion- compounds have a ________ composition.Carbon tetrachloride is always 1 atom carbon per 4 atoms chlorine.They react in specific ratios by mass.Law of Multiple Proportions- When two elements form more than ______compound, the ratios of the masses of the second element that combine with one gram of the first can be ______ to small whole numbers.The ratio of the masses of oxygen in H2O and H2O2 will be a small whole number (“2”).
3 Dalton’s Atomic Theory Elements are made up of _________Atoms of each element are _______. Atoms of different elements are different.Compounds are formed when atoms combine. Each compound has a specific _______ and ______ of atom.Chemical reactions are ________ of atoms. Atoms are not _____ or destroyed.
4 Plum Pudding ModelJ.J. Thomson is credited with the discovery of the electron_______ Experimentation→ e-/m ratio_______ Experimentation→e- Charge
12 Millikan’s Experiment X-rays_______ give some electrons a charge.
13 Millikan’s Experiment Some drops would hoverFrom the m of the drop and the charge onthe plates, he calculated the ___________
14 Rutherford’s Experiment Used to produce alpha particles (+ charged particles).Aimed alpha particles at gold foil by drilling hole in block.Since the mass is evenly distributed in gold atoms alpha particles should go through.Used gold foil because it could be made atoms thin.
26 Niels Bohr Atomic Model Fixed Orbits, Predictable PathsDerived from Max Planck’s description of light packets or quanta called photons
27 THE QUANTUM MECHANICAL MODEL 1924-Louis DeBroglie applied ____________to model1927-Erwin Schrodinger applied wave equation to modelHeinsberg’s Principle said speed and position cannot be calculated at same time
28 TOO MUCH BRAINPOWER IN ONE PLACE The Atomic Theorists