The Periodic Table - Winston-Salem/Forsyth County Schools
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 Mendeleevs Periodic Table Based on
chemical properties Organized by atomic masses Predicted
unknown elements Henry Moseley (1887 1915) His work led to a reorganization of
Mendeleevs 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 Brittle break rather than change shape
Nonmetals As you move right across the periodic table, nonmetals become more reactive As you move down a group (family), nonmetals become less reactive
Where are the most reactive nonmetals? Exit Ticket 1. 2. 3.
4. On the index card, please answer the following questions: Which group is the halogens? What is the most reactive nonmetal? What is the most reactive metal? List two metalloids.
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