Atomicstructure isotopes-100312015827-phpapp02

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Atomicstructure isotopes-100312015827-phpapp02

  1. 1. 1. Recap Atomic Structure 2. Isotopes Lesson Objectives
  2. 2. 1. Recap Atomic Structure 2. Isotopes Lesson Objectives
  3. 3. C. Chemical symbols B. Relative masses and charges of proton, neutron and electron A. Structure of atom D. Electronic configuration Recap on Atomic Structure
  4. 4. C. Chemical symbols B. Relative masses and charges of proton, neutron and electron A. Structure of atom D. Electronic configuration Recap on Atomic Structure
  5. 5. The Atomic Structure
  6. 6. WHAT IS AN ATOM? Atoms are the smallest particle of an element.
  7. 7. WHAT IS AN ELEMENT? •An element is a ____ substance that cannot be _____up into 2 or more simpler substances by chemical processes. pure spilt
  8. 8. The Story of Atoms Ernest Rutherford (1871 -1937) Democritus 460 BC Sir James Chadwick (1891 -1974) 1898 Joseph John Thompson (1856-1940) Atoms have positive charges concentrated in their small nucleus! There are neutrons! PLUM PUDDING MODEL Niels Bohr (1885-1962)
  9. 9. Bohr’s Atom electrons in orbits nucleus http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/flashfiles/atom.swf
  10. 10. Structure of Atom 10 An atom consists mostly of empty space. Negatively charged electrons move around the nucleus in fixed orbits or paths. A positively charged nucleus, densely concentrated in the centre. The nucleus contains protons and neutrons, which are tightly packed.
  11. 11. C. Chemical symbols B. Relative masses and charges of proton, neutron and electron A. Structure of atom D. Electronic configuration Recap on Atomic Structure
  12. 12. C. Chemical symbols B. Relative masses and charges of proton, neutron and electron A. Structure of atom D. Electronic configuration Recap on Atomic Structure
  13. 13. Relative Charges & Relative Masses Of Protons, Neutrons & Electrons Sub-atomic particles Symbol Relative mass Relative charge *Proton p 1 +1 *Neutron n 1 0 *Electron e 1/1840 -1 •When No. of proton = no. of electrons in an atom •It is electrically neutral •It has no net charge.
  14. 14. C. Chemical symbols B. Relative masses and charges of proton, neutron and electron A. Structure of atom D. Electronic configuration Recap on Atomic Structure
  15. 15. C. Chemical symbols B. Relative masses and charges of proton, neutron and electron A. Structure of atom D. Electronic configuration Recap on Atomic Structure
  16. 16. 16 O 16 8 chemical symbol mass number (nucleon number) proton number (atomic number) P=E No. of protons= no. of electrons atomic number (proton number) is the number of protons in an atom. Each oxygen atom has 8 protons. As the number of electrons is equal to the number of protons in an atom, each oxygen atom contains 8 electrons. Mass=P+N mass number is the total number of protons and neutrons in an atom. Number of neutrons in the oxygen atom is: 16 – 8 = 8. Interpreting Chemical Symbol
  17. 17. C. Chemical symbols B. Relative masses and charges of proton, neutron and electron A. Structure of atom D. Electronic configuration Recap on Atomic Structure
  18. 18. C. Chemical symbols B. Relative masses and charges of proton, neutron and electron A. Structure of atom D. Electronic configuration Recap on Atomic Structure
  19. 19. The Electronic Configuration of Atoms OO 16 8 Mass number (Nucleon) Atomic number (Proton)
  20. 20. The Electronic Configuration of Atoms Mg
  21. 21. Summary for Atomic Structure (I) • The structure of an atom • The relative charges & relative masses of proton, neutron & electron • Defined mass number & atomic number • Learnt how to interpret chemical symbols • The electronic configuration of atoms
  22. 22. 1. Recap Atomic Structure 2. Isotopes Lesson Objectives
  23. 23. Today… Isotopes
  24. 24. Isotopes 1. Definition of Isotopes 2. Uses of Isotopes
  25. 25. Isotopes 1. Definition of Isotopes 2. Uses of Isotopes
  26. 26. Activity • Find your fellow group members! (1min)
  27. 27. Definition of Isotopes Isotopes are atoms of the same element which contains the same number of protons but different number of neutrons.
  28. 28. Isotopes O 16 8 mass number proton number Oxygen-16 Oxygen-17 Oxygen-18 O O 17 8 18 8 n = 8 n = 17 – 8 = 9 n = 18 – 8 = 10
  29. 29. Isotopes Isotopes have the same chemical properties but slightly different physical properties
  30. 30. Q. DO ALL ISOTOPES OF THE SAME ELEMENT HAVE THE SAME MASS?
  31. 31. Isotopes 1. Definition of Isotopes 2. Uses of Isotopes
  32. 32. Pair Work
  33. 33. Uses of Radioactive Isotopes • Food irradiation • Archaeological dating (carbon-dating) • Smoke detectors • Radioactive tracers
  34. 34. Summary 1. Definition of Isotopes 2. Uses of Isotopes Recap on Atomic Structure
  35. 35. Definition of Isotopes Isotopes are atoms of the same element which contains the same number of protons but different number of neutrons.
  36. 36. Quiz • http://chemistry.about.com/library/weekly/bli onquiz.htm

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