Page 1 - 1. MIND MAP-(ISOTOPES AND ISOBARS)
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SAI International School
                                                        Class-IX
                                                 Subject- Chemistry

                                              Topic-Structure of atom
                                                      Concept Map
                                                     Lesson Notes


                                                   Concept Mapping
                 Sub Atomic Particles of an Atom and             Failure of Dalton’s atomic theory.
                   Their Discovery                                Cathode rays and discovery of
                                                                    electrons.

                                                                  Anode rays and discovery of protons
                                                                  Discovery of neutrons


                 Thomson’s Model of atom                         Plum pudding/Water melon model.
                                                                  Draw backs of Thomson’s model of
                                                                    an atom.




                 Rutherford’s Model of Atom                      Rutherford’s alpha particle
                                                                   scattering experiment.
                                                                  Rutherford’s model of an atom
                                                                  Drawbacks of Rutherford’s model of
                                                                    an atom.

                 Bohr’s Model of Atom                            Bohr’s model of an atom.
                                                                  Concept of discrete orbits.


                 Atomic number                                   Atomic numer=no of protons=no of
                 Mass number                                       electrons.
                 Arrangement of electrons in an                  Mass no.=Sum of no. of nucleons.
                   atom: Orbit                                    Bohr Burry scheme.

                                                                  2n  rule
                                                                       2
                                                                  Octet rule.
                                                                  Concept of valance electrons and
                                                                    valency.





                 Isotopes                                        Isotopes: Definition and uses.
                 Isobars                                         Isobars: Definition and examples.









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