Patterns in the Periodic Table

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Presentation transcript:

Patterns in the Periodic Table 6.4

Chemical Families CHEMICAL FAMILY: a column of elements on the periodic table with similar physical and chemical properties Each family has it’s own name Columns are numbered left to right

What are the families? ALKALI METAL: element in group 1 of the periodic table Shiny, silvery, and soft Highly reactive, so often combine with other elements and compounds Examples: Salt (NaCl), baking soda (NaHCO3), potassium (bananas!)

What are the families? ALKALINE EARTH METAL: an element in group 2 of the periodic table Shiny, silvery, not as soft as group 1 Not as reactive as group 1 Examples: calcium (milk!), fireworks (bright flames)

What are the families? NOBLE GASES: element in group 18 of the periodic table Colourless, tasteless, odourless Unreactive Non-toxic (except for radon) The diff noble gases glow diff colours when an electrical current passes through them Examples: Helium (balloons), Neon (signs)

What are the families? HALOGENS: elements in group 17 of the periodic table Are gases at room temperature and atmospheric pressure Very reactive, so often form compounds, especially with group 1 Can be poisonous Examples: Chlorine (pools, gas), Halogen (lamps)

Periodic Trends Elements in the same row also show trends PERIOD: a row in the periodic table Reactivity: group 1 more reactive than group 2, group 17 more reactive than group 16 Now let’s look at some elements!

Homework Questions Pg. 225 #1, 2, 8, 9, 10 #7 (done as a class), we will colour in periodic tables!