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Building the Periodic Table

Building the Periodic Table. Before the Table. In 1860 chemists assembled at the First International Congress of Chemists in Karlsruhe, Germany Italian chemist Stanislao Cannizzaro presented a convincing method for accurately measuring the relative masses of atoms. Mendeleev.

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Building the Periodic Table

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  1. Building the Periodic Table

  2. Before the Table • In 1860 chemists assembled at the First International Congress of Chemists in Karlsruhe, Germany • Italian chemist StanislaoCannizzaro presented a convincing method for accurately measuring the relative masses of atoms.

  3. Mendeleev • Organized what became known as the first periodic table • Placed cards with the names, masses, and properties of the elements in order. • Noticed when ordered according to atomic mass properties appeared periodically • Published the first table in 1869

  4. Two questions remained • Why could most of the elements be arranged in the order of increasing atomic mass but a few could not? • What was the reason for chemical periodicity?

  5. Henry Moseley • Worked with Rutherford • The elements in the periodic table fit into patterns better when they were arranged in increasing order according to nuclear charge, or the number of protons in the nucleus. • He defined atomic number which is the basis for the organization of the modern periodic table

  6. The Periodic Law • The physical and chemical properties of the elements are periodic functions of their atomic numbers. • When the elements are arranged in order of increasing atomic number, elements with similar properties appear at regular intervals.

  7. Modern Periodic Table • The periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column, or group. • Similar properties means?

  8. Periodicity • Periodicity occurs due to the arrangement of the electrons around the nucleus

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