how are elements classified? write a short note?
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Classification of the Elements. The next thing in our review is to classify the elements into three groups. These three groups are: metals, nonmetals, and inert gases. Let's look at where these groups are located on the periodic table and correlate them with the ability to lose and gain electrons.
The different rows of elements are called periods. ... Elements that lie in the same column on the periodic table (called a "group") have identical valance electron configurations and consequently behave in a similar fashion chemically. For instance, all the group 18 elements are inert, or noble gases.
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With the discovery of a large number of elements, it became difficult to study the elements individually, so classification of elements was done to make the study easier.
Earlier Attempts to Classify Elements
Many attempts were made to classify the known elements from time to time. The earlier attempts are as follows:
Prout’s Hypothesis (1815)
According to this theory, hydrogen atom was considered as the fundamental unit from which all other atoms were made. It is also known as unitary theory.
Dobereiner’s Triads (1829)
Dobereiner classified the elements into groups of three elements with similar properties in such a manner so that the atomic weight of the middle element was the arithmetic mean of the other two
Earlier Attempts to Classify Elements
Many attempts were made to classify the known elements from time to time. The earlier attempts are as follows:
Prout’s Hypothesis (1815)
According to this theory, hydrogen atom was considered as the fundamental unit from which all other atoms were made. It is also known as unitary theory.
Dobereiner’s Triads (1829)
Dobereiner classified the elements into groups of three elements with similar properties in such a manner so that the atomic weight of the middle element was the arithmetic mean of the other two
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