Chapter 6 TEACHER.pptx - Chapter 6 The Periodic Table Section 1 Development of the Modern Periodic Table Section 1 Development of the Modern Periodic

Chapter 6 TEACHER.pptx - Chapter 6 The Periodic Table...

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Chapter 6 The Periodic Table
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Section 1 Development of the Modern Periodic Table
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The periodic table evolved over time as scientists discovered more useful ways to compare and organize the elements. Section 1: Development of the Modern Periodic Table K What I Know W What I Want to Find Out L What I Learned
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The History of the Periodic Table http:// TSmgU
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In 1750, only 17 elements were known. As the rate of discovery increased, so did the need to organize the elements In 1789 Antoine Lavoisier grouped the known elements into metals, nonmetals, gases, and earths.
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Development of the Periodic Table In the 1700s, Lavoisier compiled a list of all the known elements of the time. Development of the Modern Periodic Table
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Development of the Periodic Table The 1800s brought large amounts of information and scientists needed a way to organize knowledge about elements. John Newlands proposed an arrangement where elements were ordered by increasing atomic mass. Development of the Modern Periodic Table
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Development of the Periodic Table Newlands noticed when the elements were arranged by increasing atomic mass, their properties repeated every eighth element. Development of the Modern Periodic Table
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Development of the Periodic Table Meyer and Mendeleev both demonstrated a connection between atomic mass and elemental properties. Moseley rearranged the table by increasing atomic number, and resulted in a clear periodic pattern. Periodic repetition of chemical and physical properties of the elements when they are arranged by increasing atomic number is called periodic law . Development of the Modern Periodic Table
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Mendeleev’s Periodic Table Medeleev made flash cards of the 63 known elements. (1863) On each card he put the name of the element, mass, and properties. When he lined the cards up in order of increasing mass, a pattern emerged. Mendeleev arranged the elements into row in order of increasing mass so that elements with similar properties were in the same column. A deck of cards can be divided into four suits—diamonds, spades, hearts, and clubs. In one version of solitaire, a player must produce an arrangement in which each suit is ordered from ace to king. This arrangement is a model for Mendeleev's periodic table.
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Periodic Table- Arrangement of elements in columns, based on a set of properties that repeat from row to row. Mendeleev’s Prediction He could not make a complete table because many of the elements had not yet been discovered. He had to leave spaces for those elements. Eka-Aluminum – one space below Al. He predicted it would be a soft metal with a low m.p. and a density of 5.9 g/cm 3 The close match between Mendeleev’s prediction and the actual properties of new elements showed how useful the periodic table could be.
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