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Discovery of the Periodic table

Dmitri Mendeleev was the first person to organize the elements in 1869 Organized them in order of increasing atomic mass Periodic: describes something that occurs or repeats at regular intervals

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Discovery of the Periodic table

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  1. Dmitri Mendeleev was the first person to organize the elements in 1869 Organized them in order of increasing atomic mass Periodic: describes something that occurs or repeats at regular intervals Looking at the pattern he knew that there were elements that had not been discovered yet so he put questions marks in their place Discovery of the Periodic table

  2. Periodic Law: the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements Cont.

  3. Sorted by metals, nonmetals, and metalloids Period: the horizontal rows of elements Group: a vertical column of elements, groups are also known as a family The Periodic Table

  4. Metals • Make up most of the elements • Solid at room temperature except Mercury • Nonmetals • More than half are gas at room temperature • Metalloids • Also known as semiconductors • Have properties of metals and non metals Metals, nonmetals, metalloids

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