Mendeleev Periodic Table

In order to represent similarities and trends in the behavior of elements, Mendeleev developed the periodic table, which is an arrangement of elements in an increasing atomic mass order in tabular form.

According to Mendeleev’s Periodic Table, elements were arranged as per their fundamental property, atomic mass, and chemical characteristics. Only 63 elements were known at the time of Mendeleev’s work. In the Mendeleev periodic table, the horizontal row and vertical columns were referred to as groups and periods, respectively. 

However, Mendeleev’s Periodic Table fails due to many flaws in it. Some of them are, that it failed to designate Hydrogen and Noble gases in it. Also, the increasing order of the atomic mass of the elements wasn’t regular throughout the table. Even, the discovery of isotopes violates the Mendeleev Periodic Law.

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Periodic Table of Elements

The Periodic table of elements is a systematic arrangement of 118 known chemical elements. These chemical elements are organized in order of increasing atomic number. The horizontal rows from left to right are called periods while the vertical columns from top to bottom are called groups in a periodic table.

Table of Content

  • What is Periodic Table ?
  • List of Periodic Table Elements
  • Important Terms in Periodic Table
  • Classification of Elements in Periodic Table
  • Mendeleev Periodic Table
  • FAQs on Periodic Table of Elements

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What is Periodic Table ?

A periodic table is a tabular representation in which all the known chemical elements are arranged in horizontal rows called periods and vertical columns called groups based on their atomic number and atomic structure respectively....

List of Periodic Table Elements

Here is the table representing 118 elements of the periodic table. The elements listed are arranged according to the increasing order of atomic number and their respective atomic weight, symbol, density, and electronegativity....

Important Terms in Periodic Table

Terms Description Atomic Number The number of protons that constitutes an element’s nucleus is called its Atomic Number (Z). e.g. Carbon contains 6 protons then, so its atomic number must be 6 only.  Atomic Mass It is defined as the average mass of the atoms of an element. It is measured on the basis of the relative natural abundance of the isotopes of the element. Atomic mass is also termed Atomic Weight (A). It is measured in the atomic mass unit (amu). Period The horizontal rows from left to right in a periodic table are called Periods. There are a total of 7 periods in the periodic table. The elements are arranged horizontally due to their similarities in properties, like the same atomic orbitals and so on. Group The vertical columns from top to bottom in a periodic table are called Groups. There is a total of 18 groups in the periodic table. The elements are arranged vertically due to their similarities in properties, as they have the same number of valence electrons in them. Symbol of an Element A symbol is a notion that is used to represent a chemical element using a letter or a combination of two to three letters. e.g. The chemical symbol of Carbon is C, while Fe is used for Iron and so on....

Classification of Elements in Periodic Table

The 118 elements are arranged in 7 periods and 18 groups as shown above. Further, the elements are divided into different blocks....

Mendeleev Periodic Table

In order to represent similarities and trends in the behavior of elements, Mendeleev developed the periodic table, which is an arrangement of elements in an increasing atomic mass order in tabular form....

FAQs on Periodic Table of Elements

What is Periodic Table of Elements?...

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