Contextualization

Throughout the history of science, several theories and models have been proposed to explain what matter is and how it is composed. One of the most fundamental and central of these theories is the atomic theory, which provides us with a basic model for understanding how matter is organized. The study of atomic models is fundamental to understanding a vast number of chemical and physical phenomena, since atoms are the building blocks of matter.

Between the 19th and 20th centuries, our understanding of atoms underwent profound transformations with the contributions of several scientists. Dalton, Thompson, Rutherford, and Bohr were some of the scientists who contributed to unraveling the mysterious world of atoms. At each stage, as experiments and technology advanced, the atomic model improved, adding new elements and details to our understanding of the structure of matter. Each of these models has its own characteristics and was essential to the development of the current atomic model.

The evolution of these atomic models not only represents the improvement of our understanding of the structure of matter, but it also reflects the way in which science operates. Through observation, experimentation, hypothesis formation, and testing, scientists were able to refine their understanding of atoms and matter in general.

Connecting this evolution to everyday life and to the world around you may not seem obvious at first, but atoms and their structure are behind many of the technologies and phenomena that we observe daily. Without an understanding of atomic structure and its properties, the development of various technologies like microchips, lasers, optical fibers, or even the operation of a simple magnet would not be possible. The evolution of atomic models also allows us to understand how chemical reactions occur, from the formation of molecules to the interaction between different substances.

To learn more about the subject, here are some suggestions for reliable resources in Portuguese:

1. History of Chemistry: Evolution of Atomic Models - Brazil School
2. Atomic Models: Dalton, Thompson, Rutherford, and Bohr - World Education
3. Evolution of Atomic Models - Chemistry - InfoSchool
4. BBC Documentary: "The History of the Atom" - Attention: This video, even though it is in English, has Portuguese subtitles.

Practical Activity: "Atomic Time: A Journey Through the Universe of Atoms"

Project Objective:

In this activity, students will be invited to research and recreate the evolution of atomic models, from Dalton's conception to the current atomic model. Each group will be responsible for one atomic model and will have to physically recreate this model, as well as present an explanatory presentation about it.

Detailed Description of the Project:

Students will be divided into groups of 3 to 5 students and each group will be in charge of recreating one of the main atomic models: Dalton Model, Thompson Model, Rutherford Model, Bohr Model or Quantum Mechanics Model. They will be asked to research the corresponding atomic model, create an explanatory presentation about it and also physically recreate the atomic model through a three-dimensional model.

Necessary materials:

1. Recyclable or craft materials to recreate atomic models (ex: modeling clay, styrofoam spheres, toothpicks, cardboard, clay, among others).
2. Internet access for research.
3. Writing material to write the report.
4. Presentation creation software (ex: PowerPoint, Google Slides, or Prezi).

Step-by-step:

1. Research: Each group should research the atomic model that was assigned to them. This research should cover the theory behind the model, the experiments that originated it, its limitations, and how it contributed to subsequent atomic models.

2. Creation of the three-dimensional model: After understanding the theory of their atomic model, the groups should create a three-dimensional model of it. It is important that the model be as representative as possible of the theory, including the location and distribution of protons, neutrons, and electrons.

3. Presentation: Each group will have to prepare a presentation explaining its atomic model. The presentation should include the theory of the model, its fundamental experiments, its limitations, and how it contributed to subsequent atomic models.

4. Report production: After completing the hands-on activity, each group will have to write a report that includes an introduction to the topic, a detailed description of the work's development, the conclusions, and the references used.

Deliverables:

At the end of the project, each group is expected to deliver:

1. Three-dimensional model: The physical atomic model that the group built, duly identified.

2. Presentation: A well-structured presentation that explains in detail the atomic model that the group worked on.

3. Report: A formal document containing four main sections, as follows:

   • Introduction: The student must contextualize the theme, its relevance, and application in the real world, as well as the objective of this project.

   • Development: The student must explain the theory behind the central atomic model of the project, explain the activity in detail, indicate the methodology used and, finally, present and discuss the results obtained.

   • Conclusion: The student must conclude the work by reviewing their main points, explaining the lessons learned, and the conclusions drawn about the project.

   • References: The student must indicate the sources they used to work on the project, such as books, web pages, videos, etc.

Upon completing this project, students will have a deeper understanding of atomic models, improved their research skills, teamwork skills, and ability to express complex concepts in a clear and understandable way.