2. A brief history lesson: Since Antoine Lavoisier first defined a chemical element and drew up a table of 33 of them for his book 'Traité Elémentaire de Chimie' (Elementary Treatise of Chemistry) published in 1789, there have been attempts to classify them. This desire to identify and classify elements continued in chemistry for another 80 years until Mendeleev stumbled upon the correct classification - the periodic table. Another man who got nearer was John Newlands, Professor of Chemistry at the School of Medicine for Women, London. He chose a table of seven columns and entered his elements in increasing order of atomic weight. The long form of the periodic table with the modern format has been attributed to H G Deming, who devised it for his textbook in 1923. Its popularity was ensured when it was adopted by a drug company as part of their promotional material. This gave it wide publicity, but clearly it met a need, and it gradually ousted all others until today it reigns supreme.

3. Periodic Table of the Elements http://www.chemicalelements.com http://www.chemsoc.org/viselements/pages/pertable_fla.htm http://chemsoc.org

4. Back to the Periodic Table… We have seen symbols, names of elements and atomic number…notice how the elements are arranged in order of INCREASING atomic number (and atomic weight) Another trend in the Periodic Table is the arrangement of Periods and Groups On your Periodic Table, Number the Periods and Groups

5. There are 3 major sections of elements in the Periodic Table… 1.Metals 2.Nonmetals 3.Metalloids Colour in each type of element and in your notes write down the characteristics of each type. In black marker, indicate the “staircase” in the table that divides the metals from the nonmetals.

6. What to do… Make your personal periodic table to use for quizzes, tests and the final exam. Write in the : »Symbol, name of »Atomic number »Period »Class »Colour the squares to represent the different types of elements