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The Periodic Table :) Heather Farrar P8
The Periodic Law says that there is a repetition of phyiscal and chemical properties of elements arranged by increasing atomic number.
Metals: Elements that are usually shiny when smooth and clean. They are solid at room temperature and conduct heat and electricity well.
Non-metals: Elements that are usually gases or brittle solids. Don't conduct heat or electricity well. Bromine is the only liquid nonmetal.
Rows: PERIODS Columns: GROUPS (families)
Groups designated with an 'A' are Representative Elements Groups designated with a 'B' are Transition Elements
Alkali Metal- Group 1A elements (except hydrogen) Alkaline Earth Metal- Group 2A elements Transition Metal- Group B elements Inner Transition Metal- along bottom of periodic table
Halogen- The highly reactive Group 7A elements Noble gases- The extremely unreactive group 8A elements Metalloid- elements with physical and chemical properties of both metals and non-metals. Silicon and germanium are two of the most important metalloids.
Contributions to the Current Periodic Table: John Alexander Newlands was the first to arrange the elements by atomic mass. Dmitri Mendeleev was the first to make a periodic table leaving room for future discovered elements. Henry Moseley discovered that elements react differently under x-rays and organized them in that way.
Photo Credit http://www.bpc.edu/mathscience/chemistry/history_of_the_periodic_table.html
