1 / 9

Atom : The smallest particle of an element that keeps all the properties of that element.

Lesson : Old Dead Guys. Atom : The smallest particle of an element that keeps all the properties of that element. Dalton’s Theory (Postulates) All matter made of tiny particles called atoms All atoms of the same element are the same

jana-barlow
Download Presentation

Atom : The smallest particle of an element that keeps all the properties of that element.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Lesson: Old Dead Guys Atom: The smallest particle of an element that keeps all the properties of that element.

  2. Dalton’s Theory (Postulates) • All matter made of tiny particles called atoms • All atoms of the same element are the same • Atoms can’t be created or destroyed, or divided into smaller parts • Different atoms combine to make compounds • Atoms are rearranged during chemical changes

  3. JJ Thomson • Cathode Ray Tube experiment • Found out the glowing beam in the tube had a negative charge • Discovered electrons

  4. Thomson’s Theory: Electrons are spread out in a large positive mass. Called the Plum Pudding Model

  5. Rutherford’s Gold Foil Experiment • Fired particles at gold foil • Some particles bounced back • Why? Because of the dense central nucleus

  6. This is Thomson’s idea of an atom. Rutherford thought all the particles would pass straight through the atoms. This is what Rutherford found out: There is a dense nucleus in the middle of the atom.

  7. Rutherford’s Model But what stops the electrons from joining the nucleus? Positive and negative attract…

  8. Bohr’s Model • The electrons must be in energy levels, orbiting around the nucleus. Planetary Model • The electrons can change energy levels depending on their energy

  9. Millikan’s Oil Drop Exp. Discovered the mass – to –charge ratio of an electron

More Related