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The Periodic Table

The Periodic Table. Chapters 6 & 7 LHS Chemistry. Development of the Periodic Table. Lavoisier: made a list of known elements (only 23!) More emerged in the 1800’s due to the use of electricity and spectrometers. Development of the Periodic Table. John Newlands -

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The Periodic Table

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  1. The Periodic Table Chapters 6 & 7 LHS Chemistry

  2. Development of the Periodic Table • Lavoisier: made a list of known elements (only 23!) • More emerged in the 1800’s due to the use of electricity and spectrometers

  3. Development of the Periodic Table • John Newlands - • Law of Octaves: properties repeat every 8th element when they are arranged in order of increasing mass • It was rebuffed because not everything fit perfectly

  4. Development of the Periodic Table • Dmitri Mendeleev • Noticed Newland’s periodic pattern • Arranged elements by increasing mass, then broke them into columns based on similar properties • Predicted the existence and properties of undiscovered elements  left blank spaces in his periodic table

  5. Development of the Periodic Table • Henry Moseley • Rearranged the elements by atomic number • This is the modern version of the PT • Periodic law: periodic repetition of chemical and physical properties of the elements when they are arranged by increasing atomic number

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