The Periodic Table WinstonSalemForsyth County Schools 周期表温顿salemforsyth县学校.pptVIP

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The Periodic Table WinstonSalemForsyth County Schools 周期表温顿salemforsyth县学校.ppt

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The Periodic Table WinstonSalemForsyth County Schools 周期表温顿salemforsyth县学校

The Periodic Table What Does Periodic Mean? Periodic means repeated in a pattern Think about a calendar: Weeks are periodic – they repeat every 7 days Dimitri Mendeleev (1834 - 1907) Created the first way to organize all known elements Based his table on the pattern of chemical properties Mendeleev’s Periodic Table Based on chemical properties Organized by atomic masses Predicted unknown elements Henry Moseley (1887 – 1915) His work led to a reorganization of Mendeleev’s table by atomic number Killed by a sniper in World War One at age 27 The Modern Periodic Table Organized into Rows = Periods Columns = Families Periods and Families The families are numbered at the top of your periodic table in your reference table Take a pen and number the periods Number one is the row with Hydrogen Number seven is the row with Francium Names of Families Group 1A or 1 Alkali Metals Names of Families Group 2A or 2 Alkaline Earth Metals Names of Families Group 7A or 17 Halogens Names of Families Group 8A or 18 Noble Gasses Special Groups Groups 3-12 Transition Metals Special Groups 1st Row at Bottom Lanthanoids OR Lanthanides Special Groups 2nd Row at Bottom Actinoids OR Actinides One Other Feature Notice the dark stairstep line. Separates metals from nonmetals Metals To the left of the stair-step line Typically solids with high melting points Good conductors of heat and electricity Malleable – can be formed into a different shape Ductile – can be drawn into wires Metals As you move left across the periodic table, metals become more reactive As you move down a group (family), metals become more reactive Remember the video about cesium? Where are the most reactive elements on the periodic table? Metalloids Touching the stair-step line Have properties in between metals and nonmetals Semiconductors – Think silicon in computer chips Nonmetals To the right of the stair-step line Typically gasses with low melting points Very poor conductors of heat and electricity B