periodic classification of element???
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All existing matter in our surroundings is made up of basic units known as elements. Initially, in 1800, only 31 chemical elements were discovered. After some advancement in technology in 1865, about 63 more elements were discovered. This created the need for the periodic classification of elements.
Presently, there are 118 elements known to us. Out of these 118 chemical elements, some elements are man-made.
Periodic Classification of Elements
Periodic Classification of Elements in the Modern Periodic Table
When there were only 31 elements it was relatively easy to study the properties of these chemical elements individually.
Now the number of elements has raised to 118, it would be very cumbersome to study the properties of every element individual.
In order to ease the work, scientists started thinking about a method so that the study of elements can be simplified.
They decided to organize the elements in a periodic table according to the information available about the elements and various characteristics shown by them.
It was observed that elements show periodicity in their properties. Many tables were made to arrange the elements in an ordered manner based on their characteristics to study the properties of elements in a fixed pattern.
Periodic Classification of Elements Characteristics
In the long form periodic table the elements are arranged in the order of their atomic numbers. Atomic number of an element is equal to the number of protons inside the nucleus of its atom.
The general features of the long form periodic table are:
There are in all, 18 vertical columns and 18 groups in the long form periodic table.
These groups are numbered from 1 to 18 starting from the left.
There are seven horizontal rows called periods in the long form periodic table. Thus, there are seven periods in the long form periodic table.
The elements of Groups 1, 2 and 13 to 17 are called the main group elements. These are also called typical or representative or normal elements.
The elements of Groups 3 to 12 are called transition elements.
Elements with atomic number 58 to 71 (Ce to Lu) occurring after lanthanum (La) are called lanthanides. Elements with atomic numbers 90 to 103 (Th to Lw) are called actinides. These elements are called f-block elements and also as inner transition elements.
Today we study the elements with the help of the modern periodic table. Periodic classification of elements is the method by which elements are grouped on the basis of their characteristics i.e. we keep the elements that are alike in one group and the rest of the elements in the other group. Some empty spaces have been left in the periodic table so that the elements that will be discovered in the future can be placed without disturbing the trending periodicity of the elements.
Hope it helps you.....
Answer:
Periodic classification of elements is the method by which elements are grouped on the basis of their characteristics i.e. we keep the elements that are alike in one group and the rest of the elements in the other group.