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Material Description



                                                                      What do you think

                                                                      looking at the


                                                                      picture on the side?

                                                                      Do you know what

                 Figure 1. Iron Pile                                  made it up?












                 Figure 2. Ice cubes that are melting









                                 Let's Find Out ....!



                         Every matter in the universe is made up of tiny particles known to experts as atoms.


               Since ancient times, humans first thought about the substances that make up each material, then

               formulated the atomic theory and until now in this sophisticated age, the existence of atoms has


               been accepted by everyone, but how the actual shape of these atoms and their constituents is not

               known with certainty. Experts only conjecture based on laboratory observations of the symptoms


               caused when a material is given a certain treatment. From the observations of these symptoms

               the experts then made a theory about the atom and estimated the shape of the atom which was

               known as the atomic model. The atomic models proposed by experts have been developing until


               now and will continue to evolve along with the increasingly sophisticated laboratory instruments

               supported by extraordinary advances in science and technology.






               Chemistry_grade_X                                                                            4
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