The Periodic Table Of Elements: A Brief Overview

1. The Periodic Table Of Elements:A Brief Overview By: Lindsey Bailey

2. The Periodic Table Of Elements • Originally constructed and published by Dmitri Mendeleev in 1869. • Families of elements within the Periodic Table of Elements • How the Periodic Table is constructed • Chemical Bonds

3. Dmitri Mendeleev • First to arrange the 63 known elements by atomic mass into a table • Left gaps in the table for new, undiscovered elements • Predicted the properties of unknown elements • For more information on Mendeleev visit http://www.chemistry.co.nz/mendeleev.htm

4. Families Of Elements • Halogens- highly active elements that have the worst odor and most brilliant color • Alkali Metals- soft, very active with very low melting points • Inert Gases- in contrast with active halogens and alkali metals, inert gases are so inactive that they form only a handful of compounds

5. The Periodic Table Includes… • Atomic Mass- the average mass of an element in atomic mass units • Atomic Number- the number of protons in an atom defines what element it is • Atomic symbol- the atomic symbol is one or two letters chosen to represent an element • Group- vertical columns • Period- horizontal row

6. Layout Of The Table Atomic Number Atomic Mass Atomic Symbol G R O U P Period

7. Chemical Bonds • Covalent Bond- when one or more pairs of electrons are shared by two atoms • Ionic Bond- when one or more electrons from one atom shift to another atom; resulting ions attract each other • No Bond- when atoms do not interact to produce an attractive force

8. No Bond

9. Make Any Sense?