Unit 4 Chapter 6.1-6.2 Periodic Table Part 1

The Periodic Table The Periodic Table was first put together by Demitri Mendeleev.

Mendeleev’s Table (~1872) Arranged according to increasing atomic mass Elements with similar properties placed in the same vertical column Missing elements were yet to be discovered and were left blank on the table

Henry Moseley – (1887-1915) British Physicist determined the atomic numbers of the elements He arranged the periodic table in order of atomic number His periodic table is the one used today

Periods – horizontal rows of the Periodic Table There are 7 Periods

Periodic Law – When the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties.

Groups – vertical columns of elements on the Periodic Table Groups are also known as families because they have similar properties.

Representative Elements Group A elements

Alkali Metals – Group 1-A elements Alkaline Earth Metals – Group 2-A elements Halogens – Group 7-A elements Noble Gases – Group 0 elements

Group B Elements Transition Metals – In the middle of the Periodic Table Inner Transition Metals (rare earth metals) – bottom of the Periodic Table

Please label your periodic table with the following: Color the families as follows: Alkali metals – red Alkaline earth metals – yellow Halogens – green Noble gases – blue Please outline the representative elements in purple and the transition metals in orange. Make a key to your colors on the top of the page along with definitions of each family in your own words.

Classification of Elements Metals – found on the left-side of the Periodic Table Nonmetals – found on the right-hand side of the Periodic Table Metalloids (or semi-metals) – along the stair-step line Properties are intermediate between metals and nonmetals

Classification of Elements Metals are… Malleable – can be hammered into sheets Ductile – can be drawn into wires Shiny or Lustrous Good conductors/poor insulators of heat and electricity All solids at room temperature except Hg Non-metals are… Brittle but often form crystals Dull Good insulators/poor or non-conductors of heat and electricity Solids, liquids and gases at room temperature Metalloids Have properties that are intermediate between metals and nonmetals.

Please label your periodic table with the metals, nonmetals and metalloids. Add definitions of these groups on the top of the page.