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Mendeleev's Periodic Table And What is Mendeleev's Periodic Law

Mendeleev's Periodic Table And What is Mendeleev's Periodic Law

Mendeleev’s Periodic Table
In 1871 Russian chemist Dmitri Mendeleev, gave a more useful and comprehensive scheme for the classification of elements. He presented the first regular periodic table in which elements of similar chemical properties were arranged in eight vertical columns called Groups. The horizontal rows of the table were called Periods and there are 12 Periods in Mendeleev Periodic table.
Mendeleev Periodic Law
“If the elements are arranged in ascending order of their atomic masses, their chemical properties repeat in a periodic manner.”
Significance Of Mendeleev’s Periodic Table
Some important contributions of Mendeleev’s Periodic Table are:
Systematic  Study of elements
He made the study of 105 elements quite convenient. Knowing the properties of one element in the group, the properties of other elements in the group can be guessed. Thus it becomes very useful in studying and remembering the properties of a large number of elements.
Prediction of new elements
While arranging elements, he left certain vacant places. These gaps represented the undiscovered elements. Mendeleev predicted the properties of these undiscovered elements on the basis of their positions. For example, he predicted the properties of scandium, gallium, and germanium which were discovered later. The observed properties of these elements were found to be similar to those predicted by Mendeleev.
Correction of atomic masses
The Mendeleev’s periodic table helped in correcting the atomic masses of some elements based upon on their positions in the table. For example, atomic mass of beryllium was corrected from 13.5 to 9. With the help of this table, atomic mass of indium, gold, platinum etc. were corrected.
Valency of Elements
Mendeleev’s classification helped in understanding the valency of elements. The valency of the elements is given by the group number

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