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compounds. Then, a major shift happened. How did chemists increase the rate of discovery of the elements? In one decade (1765-1775), chemists identified five new elements, including three colorless gases, hydrogen (H), nitrogen (N), and oxygen (0). Up until this point, why was it difficult to identify these gases? Was there a limit to the number of elements? How would chemists know when they had discovered all the elements? To begin to answer these questions, chemists needed to find a logical way to organize the elements. Early chemists used the chemical properties of elements to sort them into groups. In 1829, a German chemist, J.W. Dobereiner, published a new classification system, in which elements with similar properties were grouped together into triads. Table of a Triad Property Chlorine Bromine lodine Color State of Matter Reactivity w/ Metals

compounds. Then, a major shift happened. How did chemists increase the rate of discovery of the elements? In one decade (1765-1775), chemists identified five new elements, including three colorless gases, hydrogen (H), nitrogen (N), and oxygen (0). Up until this point, why was it difficult to identify these gases? Was there a limit to the number of elements? How would chemists know when they had discovered all the elements? To begin to answer these questions, chemists needed to find a logical way to organize the elements. Early chemists used the chemical properties of elements to sort them into groups. In 1829, a German chemist, J.W. Dobereiner, published a new classification system, in which elements with similar properties were grouped together into triads. Table of a Triad Property Chlorine Bromine lodine Color State of Matter Reactivity w/ Metals

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter1: The Nature Of Chemistry
Section1.13: The Periodic Table
Problem 1.9E
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Organizing the Elements (The History of the Periodic Table) ***Please use a different color for your responses and notes*** Directions: Please read the introductory information for each activity. Complete any parts that are highlighted in yellow and italics. Be sure to watch the posted video(s). (Posted to GC) Activity 1: Searching for an Organizing Principle A few elements, including Copper (Cu), Silver (Ag), and Gold (Au), have been known for thousands of years and have been known since ancient times. Yet, there were only 13 elements identified by the year 1700. Chemists suspected that other elements existed and even assigned names to some of these elements. However, chemists were unable to isolate the elements from their compounds. Then, a major shift happened. How did chemists increase the rate of discovery of the elements? In one decade (1765-1775), chemists identified five new elements, including three colorless gases, hydrogen (H), nitrogen (N), and oxygen (O). Up until this point, why was it difficult to identify these gases? Was there a limit to the number of elements? How would chemists know when they had discovered all the elements? To begin to answer these questions, chemists needed to find a logical way to organize the elements. Early chemists used the chemical properties of elements to sort them into groups. In 1829, a German chemist, J.W. Dobereiner, published a new classification system, in which elements with similar properties were grouped together into triads. Table of a Triad Property Chlorine Bromine lodine Color State of Matter Reactivity w/ Metals However, not all known elements could not be grouped using Dobereiner's classification system, a new classification system was needed.
Transcribed Image Text:Organizing the Elements (The History of the Periodic Table) ***Please use a different color for your responses and notes*** Directions: Please read the introductory information for each activity. Complete any parts that are highlighted in yellow and italics. Be sure to watch the posted video(s). (Posted to GC) Activity 1: Searching for an Organizing Principle A few elements, including Copper (Cu), Silver (Ag), and Gold (Au), have been known for thousands of years and have been known since ancient times. Yet, there were only 13 elements identified by the year 1700. Chemists suspected that other elements existed and even assigned names to some of these elements. However, chemists were unable to isolate the elements from their compounds. Then, a major shift happened. How did chemists increase the rate of discovery of the elements? In one decade (1765-1775), chemists identified five new elements, including three colorless gases, hydrogen (H), nitrogen (N), and oxygen (O). Up until this point, why was it difficult to identify these gases? Was there a limit to the number of elements? How would chemists know when they had discovered all the elements? To begin to answer these questions, chemists needed to find a logical way to organize the elements. Early chemists used the chemical properties of elements to sort them into groups. In 1829, a German chemist, J.W. Dobereiner, published a new classification system, in which elements with similar properties were grouped together into triads. Table of a Triad Property Chlorine Bromine lodine Color State of Matter Reactivity w/ Metals However, not all known elements could not be grouped using Dobereiner's classification system, a new classification system was needed.
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