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4.1 How are Elements Organized?
historical description of the periodic table, organization on the periodic table according to the periodic law, etc.
9
Chemistry
10th Grade
12/30/2011

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Cards

Term

law of octaves

  • (Discovered by?)
Definition
  • (John Newland)
  • elements in a given row have similar properties that repeat every eight elements.
Term

Problems w/Mendeleev's  Periodic Table

  • (How many elements are included?)
Definition
  • contained gaps
  • elements weren't in order of atomic mass
  • (63)
Term

Henry Mosely's Way to Arrange Elements

  • (What else did he create?)
Definition

By atomic number, not atomic mass


  • (the modern definition of atomic number)
Term
periodic law
Definition
Elements are arranged by thier atomic #s and elements with similiar properties occur regularly
Term
valence electron
Definition
Electrons in the last energy level
Term

group (two other names)

  • (what do they have in common?)
Definition

family/column

  • (the same number of valence electrons)
Term

period (two other names?)

  • (what do they have in common?)
Definition

series/row

  • (same number of occupied energy levels)
Term

(Order of scientists who have made contributions to the periodic table?) 
 

What did each do?

Definition

Newland (law of octaves)

Mendeleev (arranged into table by atomic mass)

Mosely (rearranged by atomic number)

Term
(how many natrual elements?)
Definition
(92)
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