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1. Recap Atomic Structure

Lesson Objectives. 1. Recap Atomic Structure. NEW. 2. Isotopes. Lesson Objectives. 1. Recap Atomic Structure. NEW. 2. Isotopes. Recap on Atomic Structure. Structure of atom. B. Relative masses and charges of proton, neutron and electron. C. Chemical symbols.

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1. Recap Atomic Structure

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  1. Lesson Objectives 1. Recap Atomic Structure NEW 2. Isotopes

  2. Lesson Objectives 1. Recap Atomic Structure NEW 2. Isotopes

  3. Recap on Atomic Structure • Structure of atom • B. Relative masses and charges of proton, neutron and electron • C. Chemical symbols • D. Electronic configuration

  4. Recap on Atomic Structure • Structure of atom • B. Relative masses and charges of proton, neutron and electron • C. Chemical symbols • D. Electronic configuration

  5. The Atomic Structure

  6. What is an Atom? Atoms are the smallest particle of an element.

  7. What is an Element? pure • An element is a ____ substance that cannot be _____up into 2 or more simpler substances by chemical processes. spilt

  8. The Story of Atoms Atoms have positive charges concentrated in their small nucleus! There are neutrons! Democritus 460 BC Joseph John Thompson (1856-1940) Ernest Rutherford (1871 -1937) Sir James Chadwick (1891 -1974) Niels Bohr (1885-1962) ATOMA PLUM PUDDING MODEL 1898

  9. Bohr’s Atom electrons in orbits nucleus http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/flashfiles/atom.swf

  10. Structure of Atom A positively charged nucleus, densely concentrated in the centre. The nucleus contains protons and neutrons, which are tightly packed. An atom consists mostly of empty space. Negatively charged electrons move around the nucleus in fixed orbits or paths.

  11. Recap on Atomic Structure • Structure of atom • B. Relative masses and charges of proton, neutron and electron • C. Chemical symbols • D. Electronic configuration

  12. Recap on Atomic Structure • Structure of atom • B. Relative masses and charges of proton, neutron and electron • C. Chemical symbols • D. Electronic configuration

  13. Relative Charges & Relative Masses Of Protons, Neutrons & Electrons • When No. of proton = no. of electrons in an atom • It is electrically neutral • It has no net charge.

  14. Recap on Atomic Structure • Structure of atom • B. Relative masses and charges of proton, neutron and electron • C. Chemical symbols • D. Electronic configuration

  15. Recap on Atomic Structure • Structure of atom • B. Relative masses and charges of proton, neutron and electron • C. Chemical symbols • D. Electronic configuration

  16. Interpreting Chemical Symbol Mass=P+N O 16 mass number (nucleon number) mass number is the total number of protons and neutrons in an atom. Number of neutrons in the oxygen atom is: 16 – 8 = 8. chemical symbol 8 proton number (atomic number) 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. P=E No. of protons= no. of electrons

  17. Recap on Atomic Structure • Structure of atom • B. Relative masses and charges of proton, neutron and electron • C. Chemical symbols • D. Electronic configuration

  18. Recap on Atomic Structure • Structure of atom • B. Relative masses and charges of proton, neutron and electron • C. Chemical symbols • D. Electronic configuration

  19. The Electronic Configuration of Atoms Mass number (Nucleon) O 16 O 8 Atomic number (Proton)

  20. The Electronic Configuration of Atoms Mg

  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. Lesson Objectives 1. Recap Atomic Structure NEW 2. Isotopes

  23. Today… Isotopes

  24. Isotopes 1. Definition of Isotopes 2. Uses of Isotopes

  25. Isotopes 1. Definition of Isotopes 2. Uses of Isotopes

  26. Activity • Find your fellow group members! (1min)

  27. Definition of Isotopes Isotopes are atoms of the same element which contains the same number of protons but different number of neutrons. Same P different n

  28. Isotopes mass number O O 17 O 18 16 proton number 8 8 8 Oxygen-17 Oxygen-18 Oxygen-16 n = 8 n = 17 – 8 = 9 n = 18 – 8 = 10

  29. Isotopes Isotopes have the same chemical properties but slightly different physical properties

  30. Q. Do all Isotopes of the same element have the same mass?

  31. Isotopes 1. Definition of Isotopes 2. Uses of Isotopes

  32. Pair Work

  33. Uses of Radioactive Isotopes • Food irradiation • Archaeological dating (carbon-dating) • Smoke detectors • Radioactive tracers

  34. Summary 1. Definition of Isotopes Recap on Atomic Structure 2. Uses of Isotopes

  35. Definition of Isotopes Isotopes are atoms of the same element which contains the same number of protons but different number of neutrons. Same P different n

  36. Quiz • http://chemistry.about.com/library/weekly/blionquiz.htm

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