Science Grade 8 Section 1 p'8286

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Science Grade 8Section 1 p.82-86

• By Kelly Shanahan
• Danielle Columbus

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The Periodic Table contains over

• 100 squares, one square for each element.

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Each square of the periodic table usually includes

• The elements atomic number,
• chemical symbol,
• name,
• and atomic mass.

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A one- or two-letter representation of an element

• Chemical Symbol

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Atomic Mass is

• The average mass of an elements atoms

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Some iron atoms have a mass of 55, others have a
mass of 56, and still others a mass of 57. These
differences are due to

• The different numbers of neutrons
  in the nuclei.

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An elements properties can be predicted from

• Its location in the periodic table.

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The main body of the periodic table is arranged
into

• Eighteen vertical columns
• Seven horizontal rows

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The electrons in a column are called

• Groups

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Groups are also known as

• Families

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Each horizontal row is called a

• Period

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Unlike the elements in a family, the elements in
each period are

• Not alike in properties

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Electrons that are involved in transfer or
sharing are called

• Valence electrons

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The number of valence electrons determines

• Whether the element
• gives up,
• shares,
• or accepts electrons.

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The elements in each group of the periodic table
have

• The same number and arrangement of valence
  electrons

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The End

• By Danielle Columbus
• Kelly Shanahan