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# Bwj 20 Periodic 20 Table 20of 20 Elements 1 Redhills[1]

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### Bwj 20 Periodic 20 Table 20of 20 Elements 1 Redhills[1]

1. 1. Periodic Table A map of the building block of matter <ul><li>Bushra Jawadi </li></ul><ul><li>Technology in Classroom </li></ul><ul><li>December 16 th 2008. </li></ul>
2. 2. Introduction to the Periodic Table <ul><li>Elements are arranged with increasing atomic number </li></ul><ul><li>For example, you can predict with reasonably good accuracy the physical and chemical properties of the element. You can also predict what other elements a particular element will react with chemically. </li></ul><ul><li>Understanding the organization and plan of the periodic table will help you obtain basic information about each of the 118 known elements. </li></ul>
3. 3. The Periodic Table <ul><li>This table is a remarkable way to show the manifold relationships between differing kinds of elements </li></ul><ul><li>The modern table was devised in 1869 by Dimitri Mendeleyev </li></ul><ul><li>He arranged the elements by weight and by their chemical properties </li></ul>
4. 4. The Periodic Table A map of the building block of matter
5. 5. Periods and Groups <ul><li>Horizontal rows in the periodic table are called periods </li></ul><ul><li>Vertical columns are called groups </li></ul><ul><li>We will learn later why the elements can be arranged in this fashion based on the arrangements of the electrons outside the nucleus </li></ul>
6. 7. Periods and Groups <ul><li>Groups </li></ul>Periods: Elements:
7. 8. Periods and Groups <ul><li>Sizes of the atoms decrease as we move from left to right across a period </li></ul><ul><li>This is due to the increasing number of protons in the nucleus, so the electrical attraction between the nucleus and the orbiting electrons gets stronger and pulls the electrons closer to the nucleus </li></ul>
8. 9. Periods and Groups <ul><li>We can display the table to demonstrate other properties as well </li></ul><ul><li>As you move from left to right across a period, the ability of the atom to attract another electron increases </li></ul><ul><li>This property is called electronegativity </li></ul>
9. 10. Periods and Groups <ul><li>All the elements in a column have remarkably similar chemical properties </li></ul><ul><li>Some of the columns have been given special names to distinguish them </li></ul><ul><li>The first group is called the alkali metals </li></ul><ul><li>The second group is the alkaline-earth metals </li></ul>
10. 11. The Periodic Table <ul><li>Assessments </li></ul><ul><li>Cross word puzzle </li></ul><ul><li>Distribute crossword puzzle filling in information about elements. Thanks You! </li></ul>