Contextualization

The Periodic Table of Chemical Elements is the 'home' of all known elements, ordered by their chemical, electrical, and physical properties. It was initially developed by the Russian chemist Dmitri Mendeleev in 1869, but over the years, it has evolved and now contains 118 elements.

The Periodic Table is more than just a table, it is a powerful tool that allows chemists to explore the relationships between various elements, predict the properties of new elements that have not yet been discovered, and even design new materials with desired properties.

In the real world, the periodic table is used in almost every sector of science. Medicine, geology, physics, chemistry, biology, and engineering are just a few of the disciplines that regularly use it. Chemists use the periodic table to understand the relationships between various elements, predict how they will interact, and identify new ways to combine elements to create new materials.

It is essential for students to understand how the Periodic Table has changed and evolved over time, as this helps to demonstrate the iterative nature of science. As new discoveries are made and new theories are developed, our models of the world around us are adapted and refined. Understanding the historical process of the development of the Periodic Table is an effective way to appreciate this aspect of science.

Atividade Prática

Activity Title:

"Building the Evolution of the Periodic Table"

Project Objective:

The objective is for students to deepen their knowledge about the historical evolution of the periodic table. They will research and present the development of the periodic table from its beginnings to the modern version we know today.

Detailed Project Description:

Students will start by researching the initial attempts to organize chemical elements and the subsequent evolution of the periodic table. The study should begin with the Greek philosophers, pass through the work of Antoine Lavoisier, John Newlands, Lothar Meyer, Dmitri Mendeleev, and reach the modern periodic table by Glenn T. Seaborg. Each group should create a timeline representing this evolution.

Required Materials:

Research materials (computer with internet access, textbooks, library), large paper or fabric for the timeline, colored pens or markers, printed elements to paste on the timeline.

Detailed Step-by-Step:

1. Form groups of 3 to 5 students.
2. The groups should divide research tasks among the members, covering different periods in the evolution of the periodic table.
3. Each group should create a visual timeline, indicating the important milestones in the evolution of the periodic table.
4. Research in detail about the contributions of each scientist to the periodic table.
5. Note or print the elements proposed by each scientist at the time and place them on the timeline.
6. Each group should present their timeline to the class, explaining the reasons behind the changes and the discoveries that led to the modern version of the periodic table.
7. Students should collectively reflect on the process of change in science and how discoveries are refined over time.

Project Deliverables:

At the end of the project, each group must present their timeline and a written report detailing their research, findings, and the process by which the table evolved.

The written report should follow the suggested structure:

1. Introduction: Students should provide an overview of the evolution of the periodic table and present the project's objective.
2. Development: Students should describe the underlying theory behind the evolution of the periodic table, explain the contributions of each scientist, the period of their work, the version of the table created by them, and how the models changed over time. Students should discuss the results obtained from this study.
3. Conclusion: Students should summarize the most important findings that emerged during the project, what they learned about the periodic table and the evolution of science, and what conclusions they were able to draw about the scientific process.
4. Bibliographic References: Students should list all the resources they used during the project.

The project should take five to ten hours of work for each student, and no more than a month from the formation of the groups to the presentation of the results.