PERIODIC TABLE ORGANIZATION AND TRENDS

INTRODUCTION  In 1869 a Russian scientist named Dmitri Mendeleyev constructed 1 st periodic table.  He organized the elements according to their properties.  An elements position on the table tells us a lot about the element!

ORGANIZING THE ELEMENTS Periods – the horizontal rows on the periodic table There are seven periods The lanthanides and actinides fit in with the sixth and seventh periods

ORGANIZING THE ELEMENTS Families/ Groups - the vertical columns on the periodic table Elements have similar properties Usually react the same in chemical reactions May look the same and be used for the same purposes Each family is numbered and has a name

ORGANIZING THE ELEMENTS Metals, Nonmetals and Metalloids  All elements to the left of the “stair step” are metals  They are good conductors  They have a shiny, metallic luster  They are malleable and ductile

ORGANIZING THE ELEMENTS  All elements to the right of the “stair step” are called nonmetals.  They are poor conductors  They usually have a dull or earthy luster  When pounded, nonmetals usually shatter or form powders

ORGANIZING THE ELEMENTS  The elements that touch the bold step- shaped line are called metalloids.  These elements have characteristics of both metals and nonmetals  There are eight of them: B, Si Ge, As, Sb, Te, Po, At

CLASS WORK/HOME WORK Read through chapter 6.1 and write out a list of characteristics for the following families: 1.Alkali Metals (Name the elements included in these) 2.Alkaline Earth metals (Name the elements included in this family) 3.Transition metals 4.Lanthanide series and actinide series 5.Halogens (Name the elements included in these) 6.Nobel gases (Name the elements included in these)