|Table of contents
|Why Do We Need To Classify Elements?
|What is a Periodic Table?
|Newland's Law of Octaves
|Lother Meyer's Classification
|Mendeleev's Periodic Table
|The Modern Periodic Table
The Classification of Elements is essential because it allows us to organize our understanding of the properties and behaviors of various elements in a systematic way.
The Periodic Table is a tabular representation of all the chemical elements arranged in order of their atomic number, electron configuration, and chemical properties.
Modern Periodic Table
In this EduRev Article, we will delve into each of these theories and ideas in detail.
Dobereiner's Triads were an important early contribution to the development of the periodic table. He observed that certain elements had similar chemical properties and could be arranged into groups of three, or "triads."
Given below are the features of Dobereiner's Triads
Here are the merits and demerits of Dobereiner's Triads
Merits of Dobereiner's Triads
By identifying patterns in the properties of elements, Dobereiner was able to make predictions about the properties of unknown elements, such as predicting the properties of the yet-undiscovered element, germanium.
Demerits of Dobereiner's Triads
Newlands' Law of Octaves was a hypothesis proposed by John Alexander Reina Newlands in 1864 to classify the elements based on their atomic weights and chemical properties.
Newlands' Law of Octaves
Here are the merits and demerits of Newlands' Law of Octaves
Merits of Newland's Law of Octaves
Demerits of Newland's Law of Octaves
Lothar Meyer was a German chemist who independently developed a periodic table around the same time as Dmitri Mendeleev. Meyer's classification system was similar to Mendeleev's in that it arranged the elements in increasing atomic weight, with elements having similar chemical and physical properties placed in the same vertical column.
Here are the merits and demerits of Lother Meyer's Classification:
Merits of Lother Meyer's Classification:
Demerits of Lother Meyer's Classification:
Dmitri Mendeleev was a Russian chemist who is credited with the creation of the first periodic table of the elements in 1869. His table organized the elements in order of increasing atomic mass and grouped elements with similar chemical properties together. Mendeleev's Periodic Table revolutionized the study of chemistry and laid the foundation for modern periodic tables that we use today.
Merits of Mendeleev's Periodic table:
1. It has simplified and systematized the study of elements and their compounds.
2. It has helped in predicting the discovery of new elements on the basis of the blank spaces given in its periodic table.
3. Atomic weights of elements were corrected. The atomic weight of Be was calculated to be 3 × 4.5 = 13.5 by considering its valency 3, was correctly calculated considering its valency 2 (2 × 4.5 = 9)
Demerits of Mendeleev's Periodic Table:
The modern periodic table is a tabular arrangement of chemical elements based on their atomic number, electronic configuration, and chemical properties. It is an improvement of earlier periodic tables such as Mendeleev's and Meyer's tables. Here are some key points about the modern periodic table:
In conclusion, the modern periodic table is a fundamental tool in the study of chemistry and has been critical in the discovery and classification of new elements. Its systematic organization and predictive power make it an essential tool for researchers and students alike.
|1. Why do we need to classify elements?
|2. What is a periodic table?
|3. What are Dobereiner's triads?
|4. What is Newland's Law of Octaves?
|5. What is the genesis of periodic classification?