Maharashtra State BoardHSC Science (General) 11th
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Explain the following. The atomic radii of Cl, I, and Br are 99, 133, and 114 pm, respectively. - Chemistry

Short Note

Explain the following.

The atomic radii of Cl, I, and Br are 99, 133, and 114 pm, respectively.

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Solution

  1. Cl, I and Br belong to group 17 (halogen group) in the periodic table.
  2. As we move down the group from top to bottom in the periodic table, a new shell gets added to the atom of the elements.
  3. As a result, the effective nuclear charge decreases due to an increase in the atomic size as well as an increased shielding effect.
  4. Therefore, the valence electrons experience less attractive force from the nucleus and are held less tightly resulting in the increased atomic radius.
  5. Thus, their atomic radii increase in the following order down the group.
    Cl (99 pm) < Br (114 pm) < I (133 pm)
    Hence, the atomic radii of Cl, I, and Br are 99, 133, and 114 pm, respectively.
Concept: Periodic Trends in Elemental Properties
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APPEARS IN

Balbharati Chemistry 11th Standard Maharashtra State Board
Chapter 7 Modern Periodic Table
Exercises | Q 1. (B) | Page 108
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