Periodic ClassificationsIntroduction to the Modern Periodic Table

Introduction to the Modern Periodic Table

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    • Modern Periodic Table
    • Summary
    • What’s Next?

    In the previous segment of the chapter ‘Periodic Classification of Elements’, we learnt about the fourth and fifth limitations of Mendeleev’s work. In this segment, let us get introduced to the modern periodic table.

    What is the Modern periodic table?

    Mendeleev periodic table

    • The periodic table, put forth by Mendeleev, had major limitations. With time, the number of elements being discovered increased and fitting them into the table according to the periodic law by Mendeleev seemed difficult.

    Henry Mosely

    • When the elements discovered later did not follow the periodic law given by Mendeleev, the law was modified around 1913, by the British physicist Henry Moseley who realised all the elements will show periodicity if arranged based on their atomic numbers and not their atomic masses.
    • The number of protons present in the nucleus of the atom of that element is called its

    Atomic number. All elements have fixed atomic numbers.

    For example, the atomic numbers of hydrogen, helium, lithium, and beryllium are 1, 2, 3, and 4 respectively. So, they occupy the first four positions in the periodic table.

    Atomic numbers of hydrogen, helium, lithium and beryllium

    • Henry Moseley stated that the physical and chemical properties of elements do occur periodically but this happens when the elements are arranged according to their atomic numbers.
    • There emerged a new law for studying the periodicity of elements called the Modern Periodic Law. It stated that Properties of elements are periodic functions of atomic numbers.
    • The name of the table based on this law was called the Modern Periodic Table. It helped in placing the newly discovered elements properly in the periodic table.
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