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
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
![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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2586fd1d-7fe2-48f3-b335-66e87f068fa0%2F99db81a8-75c0-4c39-90e3-a2fc61b81be2%2Fdv1ef9_processed.jpeg&w=3840&q=75)
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