quantum mech model

• claimed that matter is made of small, hard particles and properties of these particles also determine properties of matter

  
  

  Democritus
• Made the first atomic theory.

  John Dalton
• Viewed atoms as tiny solid balls

  John Dalton
• Showed that atoms are made of smaller things


  J.J Thompson
• made plum pudding model/raisin bread model


  J.J Thompson
• discovered the protons and nucleus

  Ernest Rutherford
• showed atoms have (+) particles in the center and mostly empty space


  Ernest Rutherford
• improved Rutherford's model


  Niels Bohr
• proposed that electrons move around in certain layers/shells


  Niels Bohr
• discovered neutrons

  james chadwick
• worked with rutherford

  james chadwick
• discovered particles with no charge

  james chadwick
• particles with no charge

  neutrons
• new atomic model has electrons moving around nucleus in a cloud

  Modern/Cloud Atomic Model
• This model shows that electrons circle the nucleus


  Bohr Model
• Electrons are attracted to positive nucleus
• Protons and nucleus are positively charged
• Bohr Model and Quantum Mechanical Model are being used today
• This states that electrons behave as particles

  Bohr Model
• This states that electrons behave as particles AND waves

  Quantum Mechanical Model
• Proposed the Quantum Mechanical Model thru math equations

  Erwin Schrodinger
• Region of space is called orbital
• What does ''n'' mean?

  Principal quantum number
• how many electrons in the 1-4 energy levels?

  2, 8, 18, and 32
• what are the sublevels in each energy levels?


  s

  s and p

  s, p, and d

  s, p, d, and f
• sublevel : orbital

  s : 1

  p : 3

  d : 5

  f : 7
• max of 2 electrons can occupy in one orbital
• Up arrow and down arrow rotates in?

  Clockwise and Counterclockwise
• year where democritus supposedly had his discovery

  400 B.C