Unit 4: The Periodic Table How is the periodic table a useful tool?

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Presentation transcript:

Unit 4: The Periodic Table How is the periodic table a useful tool?

Johann Döbereiner- 1817 Arranged elements into groups of three (triads) 1

John Newlands- 1864 The “Law of Octaves” When arranged in order of increasing atomic weight, an element showed properties similar to those of an element 8 places ahead and 8 places behind No noble gases discovered yet!

Dmitri Mendeleev- 1869 1

Dmitri Mendeleev- 1869 Published a table of 63 elements Used properties to sort elements into groups Arranged the elements in order of increasing atomic mass Left blanks in table for undiscovered elements 1

Henry Moseley- 1913 Arranged elements according to atomic number (modern periodic table) 1

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