chapter 5 organizing the elements
DESCRIPTION
CHAPTER 5 ORGANIZING THE ELEMENTS. Lavoiser (la vwah zee ay). French chemist Grouped known elements into 4 categories: -metals, nonmetals, gases and earths. Mendeleev. Mendeleev’s Periodic Table. Mendeleev ( Men duh LAY uff) 1860’s Modeled on solitaire - PowerPoint PPT PresentationTRANSCRIPT
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CHAPTER 5ORGANIZING THE
ELEMENTS
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Lavoiser (la vwah zee ay)
• French chemist
• Grouped known elements into 4 categories:
-metals, nonmetals, gases and earths.
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Mendeleev
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Mendeleev’s PeriodicTable
• Mendeleev ( Men duh LAY uff)• 1860’s• Modeled on solitaire• If elements lined up in order of
increasing mass, a pattern emerged.
• Elements with similar properties in same column
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Periodic
• occurring or appearing at regular intervals or in regular cycles.
newspapers, magazines, calendars
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Periodic Table• An arrangement of elements in columns, based on a set of properties that repeat from row to row.
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• Mendeleev left spaces for undiscovered elements.
• The accuracy of his predictions showed how useful his table could be.
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Modern Periodic Table
• Elements arranged by increasing atomic number ( # of protons) instead of mass.
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- The horizontal rows are called periods, and are labeled from 1-7.
- The vertical columns are called groups, and are labeled from 1-18.
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Groups (Columns)…Here’s Where the Periodic Table Gets Useful!
• Elements in the same group have similar chemical an physical properties!!
Why??
• They have the same number of valence electrons.
-highest occupied energy level of an atom.
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Mendeleev’s PeriodicTable
• Mendeleev ( Men duh LAY uff)• 1860’s• Modeled on solitaire• If elements lined up in order of
increasing mass, a pattern emerged.
• Elements with similar properties in same column
![Page 12: CHAPTER 5 ORGANIZING THE ELEMENTS](https://reader033.vdocuments.site/reader033/viewer/2022061415/56812a89550346895d8e29ed/html5/thumbnails/12.jpg)
Periodic
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Periodic Table
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• Mendeleev left ______ for undiscovered _______.
• The __________ of his predictions showed how useful his table could be.
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Modern Periodic Table
• Elements arranged by ____________________ ( # of protons) instead of mass.
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- The horizontal rows are called ________, and are labeled from 1-7.
- The vertical columns are called _______, and are labeled from 1-18.
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Groups (Columns)…Here’s Where the Periodic Table Gets Useful!
• Elements in the same _____ have similar _______ and _________ properties!!
Why??
• They have the same number of _______________.
-highest occupied energy level of an atom.