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JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Mock Test - Classification Elements Periodicity Properties

  • question_answer
    The correct arrangement of decreasing order of atomic radius among Na, K, Mg and Rb is

    A)  Rb>Na>K>Mg

    B)  K>Rb>Na>Mg

    C)  Rb>K>Na>Mg

    D)  Mg>Rb>K>Na

    Correct Answer: C

    Solution :

    [c] NA, K and Rb are of group 1 elements and size increase down the group 1 elements\[(\downarrow )\]. Na and Mg are of group 1 and 2 elements respectively but both belong to 3rd period. Along the period size decreases (\[\to \]), i.e. Size of Na>Mg.
    Hence the order of sizes is
    \[\] \[\]
                            Group 1             group 2
                            \[\Downarrow \]     \[\Downarrow \]                        \[\Downarrow \]     \[\Downarrow \]
    Period\[\Rightarrow \]       5       4              3       3
     


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