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Question: Which of the following set of atomic numbers represent representative element:...

Which of the following set of atomic numbers represent representative element:

A

5, 13, 30, 53

B

11, 33, 58, 84

C

5, 17, 31, 54

D

9, 31, 53, 83

Answer

C, D

Explanation

Solution

Representative elements (also known as main group elements) are elements found in the s-block and p-block of the periodic table. This includes elements from Group 1, Group 2, and Groups 13-18.

  • Option (A): 5, 13, 30, 53

    • 5 (Boron, B): Group 13 (p-block) - Representative element.
    • 13 (Aluminum, Al): Group 13 (p-block) - Representative element.
    • 30 (Zinc, Zn): Group 12 (d-block) - Transition element, not a representative element.
    • 53 (Iodine, I): Group 17 (p-block) - Representative element.

    Since Zinc (Z=30) is a transition element, this option is incorrect.

  • Option (B): 11, 33, 58, 84

    • 11 (Sodium, Na): Group 1 (s-block) - Representative element.
    • 33 (Arsenic, As): Group 15 (p-block) - Representative element.
    • 58 (Cerium, Ce): f-block (Lanthanide series) - Inner transition element, not a representative element.
    • 84 (Polonium, Po): Group 16 (p-block) - Representative element.

    Since Cerium (Z=58) is an inner transition element, this option is incorrect.

  • Option (C): 5, 17, 31, 54

    • 5 (Boron, B): Group 13 (p-block) - Representative element.
    • 17 (Chlorine, Cl): Group 17 (p-block) - Representative element.
    • 31 (Gallium, Ga): Group 13 (p-block) - Representative element.
    • 54 (Xenon, Xe): Group 18 (p-block) - Representative element (noble gas).

    All elements in this set are representative elements. This option is correct.

  • Option (D): 9, 31, 53, 83

    • 9 (Fluorine, F): Group 17 (p-block) - Representative element.
    • 31 (Gallium, Ga): Group 13 (p-block) - Representative element.
    • 53 (Iodine, I): Group 17 (p-block) - Representative element.
    • 83 (Bismuth, Bi): Group 15 (p-block) - Representative element.

    All elements in this set are representative elements. This option is also correct.

Based on the standard definition of representative elements (s-block and p-block elements, including noble gases, as per NCERT), both options (C) and (D) consist entirely of representative elements.