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Development of the Modern Periodic Table

Explore the history and development of the periodic table from Antoine Lavoisier's initial list of elements to Henry Moseley's breakthrough in arranging atoms by atomic number. Discover how early chemists like Mendeleev and Meyer contributed to organizing elements based on atomic mass and properties.

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Development of the Modern Periodic Table

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  1. Development of the Modern Periodic Table Chapter 6 Section 1

  2. History • Late 1790s, French scientist Antoine Lavoisier compiled list of elements. • 23 elements at the time milenao.blogs.sapo.pt

  3. History (cont.) • During 1800s, electricity, development of a spectrometer and the industrial revolution helped to discover new elements. • 1860 – They agreed on a method to determine atomic masses. • Chemists needed a tool to organize facts about elements. • 1870 – 70 elements

  4. John Newlands • In 1864, John Newlands, an English chemist proposed an organization scheme for elements. • Observed a pattern that was periodic. • Called the Law of Octaves because the pattern repeated every 8th element. www.neoam.cc.ok.us

  5. John Newlands (cont.) • Harshly criticized for using musical analogy • Law did not work for every element • Elements were arranged by atomic mass

  6. Meyer, Mendeleev and Moseley • In 1869, Lothar Meyer, a German chemist and Dmitri Mendeleev, a Russian chemist showed a connection between atomic mass and elemental properties www.apsidium.com www.bluffton.edu

  7. Meyer, Mendeleev and Moseley • Mendeleev published first so he’s given more credit than Meyer and he better demonstrated its usefulness. • Arranged by increasing atomic mass had periodic properties. • Table had blank spaces for undiscovered elements.

  8. Meyer, Mendeleev and Moseley • Mendeleev’s table was not completely accurate. • In 1913, Henry Moseley, an English chemist arranged atoms by increasing atomic number. • This arrangement showed a clear periodic pattern of properties (periodic law).

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