Understand Mendeleev's Periodic Table. click on the link to Watch the VIDEO explanation:
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In order to make a proper study of elements they should be systematically classified. In 1869 the Russian chemist Dmitri Ivanovich Mendeleev published the first successful classification of elements. Mendeleev noted that the repeating patterns in the behaviour of elements could be arranged in a sequence. He arranged the elements in the increasing atomic weights from left to right in rows and from top to bottom in groups. In this arrangement elemental that most closely resemble each other tend to fall in the same vertical group. This group similarly reoccurs periodically once in each row and the tabular format is known as periodic table. Watch carefully the filling up of the elements in the periodic table. Mendeleev left gap in his table. This was done to avoid exception to the idea that elements with similar properties fall in same vertical group. Instead of seeing these gap as defects he boldly predicted the existence of undiscovered elements. Table shows just how accurate his predictions were. Thus Mendeleev's periodic table although not used any more formed the basis of the modern periodic table. The predictive nature of Mendeleev's periodic table led to its wide acceptance as a tremendous scientific achievement. he postulated a law called the his periodic law which states that the physical and chemical properties of elements are periodic function of their atomic weight or mass. Click on the buttons provided to learn about conclusion and demerits of Mendeleev's classification.
Watch Video
In order to make a proper study of elements they should be systematically classified. In 1869 the Russian chemist Dmitri Ivanovich Mendeleev published the first successful classification of elements. Mendeleev noted that the repeating patterns in the behaviour of elements could be arranged in a sequence. He arranged the elements in the increasing atomic weights from left to right in rows and from top to bottom in groups. In this arrangement elemental that most closely resemble each other tend to fall in the same vertical group. This group similarly reoccurs periodically once in each row and the tabular format is known as periodic table. Watch carefully the filling up of the elements in the periodic table. Mendeleev left gap in his table. This was done to avoid exception to the idea that elements with similar properties fall in same vertical group. Instead of seeing these gap as defects he boldly predicted the existence of undiscovered elements. Table shows just how accurate his predictions were. Thus Mendeleev's periodic table although not used any more formed the basis of the modern periodic table. The predictive nature of Mendeleev's periodic table led to its wide acceptance as a tremendous scientific achievement. he postulated a law called the his periodic law which states that the physical and chemical properties of elements are periodic function of their atomic weight or mass. Click on the buttons provided to learn about conclusion and demerits of Mendeleev's classification.
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