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Name the anomalous pairs of elements in ...

Name the anomalous pairs of elements in the Mendeleev's periodic table.

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In Mendeleev's periodic table elements are arranged in the increasing order of their atomic weiths. But few elemetns are arranged in reverse order. They are called anomalous pairs. They are Argon and Potassium, Tellurium and Iodine, Cobalt and Nickel.
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Knowledge Check

  • PASSAGE - 1: In Mendeleeff's periodic table elements were classified on the basis of atomic weight & in modern periodic table on the atomic number. The lighter elements of 2 & 3 periods show similarities in their properties called diagonal relationship 1. Which of the following element is not present in Mendeleeff's periodic table

    A
    Carbon
    B
    Chlorine
    C
    Argon
    D
    Potassium

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