Chapters 6 & 7 Chemistry 1L Cypress Creek High School

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Presentation transcript:

Chapters 6 & 7 Chemistry 1L Cypress Creek High School Unit 7: Periodic Table Chapters 6 & 7 Chemistry 1L Cypress Creek High School 1

Part 1: History of the Periodic Table 2

Johann Wolfgang Döbereiner German chemist 1780-1849 Noticed that there was a pattern in the atomic masses and atomic numbers of certain elements These sets of patterns became known as “Döbereiner's triads”

Johann Wolfgang Döbereiner

John Newlands English chemist 1837-1898 In 1865, proposed the Law of Octaves whereby every eighth element has similar properties.

John Newlands

Dmitri Mendeleev Russian chemist 1834-1907 Arranged periodic table by increasing atomic mass Aligned properties in vertical columns Some elements fell into the wrong column lik Te & I ; Co & Ni

Dmitri Mendeleev

Henry Moseley English physicist 1887-1915 Rearranged the modern table by atomic number Used X-ray spectrometer to find the atomic numbers

Henry Moseley