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Subject: Physics and Chemistry 3rd ESO
Language: English (B1)
INTRODUCTION
At the beginning of the nineteenth century, when Dalton proposed his atomic theory, only two dozen chemical elements were known. In spite of such a small number of elements, several attempts had already been made to classify them into families in terms of common properties.
The discovery of new elements during the nineteenth century encouraged chemists to search for better classification criteria. Russian chemist D. I. Mendeleev and German doctor J. L. Meyer, simultaneously and independently suggested ordering the elements in increasing order of atomic mass and adding in columns those which had similar chemical properties.
In 1869, Mendeleev published a periodic table where he ordered in rows and columns the 63 elements known until now. Moreover, with great intuition, he left empty spaces for elements that had not yet been isolated. Over time, these elements were discovered and, furthermore, it was proved that they had the properties anticipated by Mendeleev.
OBJECTIVES
In the following two hours we will learn to sort the elements of the Periodic Table and predict their properties according to their placement in the table. We will also learn to relate the element names with their corresponding chemical symbol, useful for identifying compounds that we can find in our daily lives.
LESSONS
Now go to Lesson 1 and Lesson 2
Lesson 1 - The relation between the element names and their chemical symbols
Lesson 2 - The order of the elements in the Periodic Table and their corresponding properties
Short url: https://clilstore.eu/cs/5418