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iva wallaceon 18 November 2012
Transcript of Periodic Table
What are the rows called? Organization of the table Group 1 alkali metals
Group 2 alkaline earth metals
Group 3-12 transition metals
Group 17 halogens
Group 18 noble gases Special group names What are Diatomic Elements? Most of the elements are metals. The metals are located to the left of the metalloids. Metals tend to have higher densities, and higher melting and boiling points than nonmetals. Metals are good conductors of heat and electricity and are malleable and ductile. Where are the Metals? The first periodic table was created in 1869 by Dimitri Mendeleev. He arranged elements by increasing atomic mass. Most elements are found in nature as single atoms, monoatomic. Seven elements are found in nature as diatomic molecules. These elements have two atoms joined together by one or more covalent bonds. The diatomic elements are hydrogen (H2), nitrogen (N2), oxygen (O2), fluorine (F2), chlorine (Cl2), bromine (Br2), and iodine (I2). Where are the Nonmetals? Where are the Metalloids? Interactive Periodic Table ptable.com The rows on the periodic table are called periods. A column on the periodic table is called group or family. The metalloids are the elements touching the staircase. The nonmetals are located on the right side of the staircase. They are not good conductors and are not malleable or ductile. The have lower melting and boiling points than metals.