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ATOMIC TIMELINE
The document describes the development of atomic theory over time through several scientific models. It begins with Democritus' idea in the 5th century BC that all matter is made of indivisible atoms. The document then outlines models by John Dalton, J.J. Thompson, Ernest Rutherford, Niels Bohr, Erwin Schrodinger and Werner Heisenberg. Each model built on previous work and provided new insights about atoms, such as Dalton's billiard ball model, Thompson's plum pudding model, Rutherford's nuclear model, Bohr's planetary model, and Schrodinger and Heisenberg's quantum mechanical model describing electrons as waves. The document uses these historic theories to teach students
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ATOMIC TIMELINE
- 1. The Development of the Atomic Theory TeresitaM. Perucho Master Teacher I - Science
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- 3. LEARNING COMPETENCY Determine thenumber of protons, neutrons, and electrons in a particular atom 3
- 4. OBJECTIVES ➢ Infer thedevelopment of atomic theory ; ➢ Simulate and describe each atomic models ; ➢ deduce that scientific models may change over time and ➢ Construct an atomic timeline using recycled materials. 4
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- 6. 6 Choose the bestanswer 1. This diagram represents particles in a ______________ state. a. Solid b. liquid c. gas
- 7. 7 Choose the bestanswer 1. This diagram represents particles in a ______________ state. a. Solid b. liquid c. gas
- 8. 8 Choose the bestanswer 2. Particles are always moving. a. True b. False
- 9. 9 Choose the bestanswer 2. Particles are always moving. a. True b. False
- 10. 10 Choose the bestanswer 3. In which state of matter will there be the LARGEST space between molecules? a. Solid b. Liquid c. Gas
- 11. 11 Choose the bestanswer 3. In which state of matter will there be the LARGEST space between molecules? a. Solid b. Liquid c. Gas
- 12. 12 Choose the bestanswer 4. All matter is made up of tiny _______________ A. Energy B. Particles (atoms and molecules) C. bits D. antimatter
- 13. 13 Choose the bestanswer 4. All matter is made up of tiny _______________ A. Energy B. Particles (atoms and molecules) C. bits D. antimatter
- 14. 14 Choose the bestanswer 5. Which has a strongest Inter molecular Forces?
- 15. 15 Choose the bestanswer 5. Which has a strongest Inter molecular Forces? a. Solid b. Liquid c. Gas
- 16. 16 ENGAGE Can’t wait togo out and have some fun?
- 17. Lets Take aTrip Through Time 17 Come with us in a historical adventure! Let’s find out the story behind the small but terrible ATOM.
- 18. ATOMIC THEORIES TIMELINE 18 NAMEDemocritus John Dalton JJ Thompson Ernest Rutherford Niels Bohr Schrödinger Heisenberg TIME FRAME KEY POINTS MODEL
- 19. DEMOCRITUS 460 – 370BC 19 ➢There are various basic elements from which all matter is made. ➢ Named the smallest particle of matter “atomos” – not to be cut. ➢ Everything is composed of small atoms moving in a void and capable of joining. ➢ Some atoms are round, pointy, oily, have hooks, etc. to account for their properties. ➢ Ideas rejected by leading philosophers because void = no existence
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- 21. JOHN DALTON 1766- 1844 21 Introducedhis ideas in 1803 • Each element is composed of extremely small particles called atoms • All the atoms of a given element are identical, but they differ from those of any other element • Atoms are neither created nor destroyed in any chemical reaction • A given compound always has the same relative numbers and kinds of atoms
- 22. 22 amazing !!! John Dalton BilliardBall Model 1807
- 23. 23 Discovered electron 1897 –Cathode Ray Experiment • Plum Pudding model 1904 – Electrons in a soup of positive charges • Discovered isotopes 1913 J.J. Thompson 1856-1940
- 24. 24 amazing !!! Cathode RayTube Experiment
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- 26. Ernest Rutherford 1871-1937 26 ➢ Atomshave dense , positive nucleus. ➢ Atoms mass is mostly in the nucleus . ➢ The nucleus has a positive charge(Moseley) ➢ Electrons in fixed orbit
- 27. Alpha Particle Experiment GoldFoil Experiment 27 A piece of gold foil was hit with alpha particles, which have a positive charge. Most alpha particles went right through. This showed that the gold atoms were mostly empty space. Some particles had their paths bent at large angles. A few even bounced backward.
- 28. 28 I often come acrossthis symbol whenever we talk about science!!! Ernest Rutherford’s Model 1909
- 29. “ 29 We are learningso much in this trip I am having a blast , excited to know more about the theories of atom
- 30. Niels Bohr 1885-1962 30 ➢ Electronsorbit the positive nucleus in orbits that have a set size and energy. ➢ The energy of the orbit is related to its size. The lowest energy is found in the smallest orbit. ➢ the change in an electron's energy as it makes a quantum jump from one orbit to another ➢ Radiation is absorbed or emitted when an electron moves from one orbit to another.
- 31. 31 It looks like thesolar system!!! Planetary Model 1913 Looks like the model of Sir Rutherford.
- 32. Ernst/Erwin Schrödinger 1887-1961 WernerHeisenberg 1901-1976 32 ➢ Electrons are in probability zones called “orbitals”, not orbits and the location cannot be pinpointed ➢ Electrons are present in a blurry “electron cloud”. It is within this area that we derived the electron configuration of an atom. ➢ – Electrons are particles and waves at the same time ➢ Developed quantum numbers based on theories of Einstein and Planck Electrons have an intrinsic property called spin, and an electron can have one of two possible spin values: spin-up or spin-down. Any two electrons occupying the same orbital must have opposite spins.
- 33. 33 Wow !!! Quantum MechanicalModel/Wave Mechanical model 1926 That is what we call ORBITALS.
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- 35. ATOMIC THEORIES TIMELINE 35 NAMEDemocritus John Dalton JJ Thompson Ernest Rutherford Niels Bohr Schrödinger Heisenberg TIME FRAME KEY POINTS MODEL
- 36. Who among youwill develop a better theory and win the Nobel Prize?
- 37. EVALUATION C A B DE Arrange the following atomic models in order and identify who is the physicist that developed the theory. Schrodinger& Heisenberg , Erwin Rutherford , John Dalton , Neils Bohr and JJ Thompson
- 38. EVALUATION C A B D E JJ Thompson John Dalton ErwinRutherford Neils Bohr Schrodinger& Heisenberg
- 39. ASSIGNMENT TO BE SUBMITTEDON FRIDAY 39 Construct an atomic timeline using recycled materials EXTEND
- 40. 40 ENGAGE How do youfind today’s lesson ? Please write your comment on the comment box Join us again on our next adventure . See u soon!
- 41. Don’t forget tovisit our Fb page science genius for our asynchronous activities & also please pass your activity & quiz today in our fb messenger. Thank you