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Chapters 6 & 7 Chemistry 1L Cypress Creek High School

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

2 Part 1: History of the Periodic Table
2

3 Johann Wolfgang Döbereiner
German chemist 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”

4 Johann Wolfgang Döbereiner

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

6 John Newlands

7 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

8 Dmitri Mendeleev

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

10 Henry Moseley

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