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Chapter 5: The Periodic Table
Video
Section 1: Organizing the Elements
Video 2
Recognizing a Pattern
• Dmitri Mendeleev:– In this periodic table,
Mendeleev arranged elements in rows by increasing atomic mass
– He was able to predict new elements
– Few elements did not fit the pattern
Changing the Arrangement
• The modern periodic table organizes elements by atomic number. When the elements are arranged in this way, elements that have similar properties appear at regular intervals.
• Elements become less metallic across each period (each row of the table is a period)
• Elements in a group have similar properties (each column of the periodic table is a group)