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Periodic Classification of Elements

Importance and Limitations of Modern Periodic Table

Importance of Modern Periodic Table 1. Based on atomic number –     The arrangement of elements in modern periodic table is according to their increasing order of atomic number. Atomic number increases by 1 unit (not fractional) in going from one element to the next element and equal to the number of electrons. Thus, the …

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Arrangements in Modern Periodic Table    (Long Form of Periodic Table)    

 The arrangement  in periodic table is given by Bohr so it is also known as Bohr’s table or Long form of periodic table. This table is prepared on the basis of – (a) increasing order of atomic number or electronic configuration. (placed in a period) (b) same number of valence electron/electrons. (placed in one group) …

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INTRODUCTION TO MODERN PERIODIC TABLE

The modern periodic table of elements is based on Mendeleev’s observations. The only difference is instead of being organized by atomic masses, the modern table is arranged by atomic number (Z). Henry Moseley, in 1913, found that atomic number is more fundamental property of an element than its atomic mass. Atomic number helps in arranging …

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Importance of Mendeleev’s Periodic Table

Read First – Mendeleev’s Periodic Table (1) Systematic Study of the elements Mendeleev’s periodic table was developed in accordance to- (a) increasing atomic masses. (b) grouping of similar elements together. By the way, the study of elements became quite simpler, as if properties of one element in a particular group were known, properties of others …

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Mendeleev’s Periodic Table

Read first – Periodic Classification of Elements – Inroduction, Dobereiner’s Traids Newlands’ Law of Octaves A most important contribution on arrangement of elements after Newland was given by a Russian Chemist called Dmitri Mendeleev. Before discussing Mendeleev’s periodic table, we should learn the meaning of following terms – Periodic Table –  It is a chart …

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Newlands’ Law of Octaves

Read First – Dobereiner’s Traids Read More – CHEMISTRY – MATTER / ATOMS AND MOLECULES / STRUCTURE OF THE ATOM / CHEMICAL REACTIONS AND EQUATIONS / ACIDS, BASES AND SALTS / METALS AND NON-METALS / CARBON AND ITS COMPOUNDS / PERIODIC CLASSIFICATION OF ELEMENTS   After as Dobereiner’s Traids was ruled out, an English chemist J.A.R. Newlands observed similarities in physical and chemical properties of every …

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PERIODIC CLASSIFICATION OF ELEMENTS – Introduction, Dobereiner’s Triads

  INTRODUCTION Till 18th centuries, only 30 elements were known. By the year 1865, 63 elements were discovered. Till date , 118 elements have been discovered and many more may be known in future. Read More – CHEMISTRY – MATTER / ATOMS AND MOLECULES / STRUCTURE OF THE ATOM / CHEMICAL REACTIONS AND EQUATIONS / ACIDS, BASES AND SALTS / METALS AND NON-METALS / CARBON …

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