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Chemistry / Periodic Table

Chemistry / Periodic Table

At present, 114 elements are known to us. Its important to organize all the information we know about these elements. This forms the basis of periodic table.
Elements are classified on the basis of similarities in their properties. „ Döbereiner grouped the elements into triads and Newlands gave the Law of Octave, but it was „ Mendeleev who arranged the elements in increasing order of their atomic masses and according to their chemical properties. He made a table containing all elements and called it periodic table.
Anomalies in arrangement of elements based on increasing atomic mass could be removed when the elements were arranged in order of increasing atomic number, a fundamental property of the element discovered by Moseley. He made the Modern Periodic Table
Elements in the Modern Periodic Table are arranged in 18 vertical columns called groups and 7 horizontal rows called periods. Elements thus arranged show periodicity of properties including atomic size, valency or combining capacity and metallic and non-metallic character.

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Exercises
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  • Periodic Table - SmartTest

    A SmartTest on Periodic Table

    • Accessed by: 447 Students
    • Average Time: 00:05:09
    • Average Score: 59.65
    • Questions: 68
    • Introduction to Periodic Table
    • Dobereiner's Triads
    • Newland's Law of Octaves
    • Mendeleev's Periodic Table
    • Modern Periodic Table
    • Periodicity
    • Types of elements
    • Merits and Demerits of Long Form of Periodic Table
    • Characteristics of Modern Periodic Table
    • Uses of Periodic Table
    • Review of Periodic Table
  • Periodic Table -- Summary

    Learnhive Lesson on Periodic Table

    • Accessed by: 400 Students

    Periodic Table

    Learnhive Lesson on Periodic Table

    • Accessed by: 177 Students

    Merits and Demerits of Mendeleev Periodic Tab

    Learnhive Lesson on Merits and Demerits of Mendeleev Periodic Table

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