Which of the following elements has the smallest atomic radius?

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  1. Bromine
  2. Chlorine
  3. Sodium
  4. Calcium

Answer (Detailed Solution Below)

Option 2 : Chlorine
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Detailed Solution

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The correct answer is Chlorine.

  • Among Bromine, Chlorine, Sodium and Calcium; the atomic radius of Chlorine is the smallest.

Key Points

  • The atomic radius is the distance from the nucleus of an atom to the outermost electrons.
  • Atomic radii vary in a predictable way across the periodic table.
  • The atomic radius increases from top to bottom in a group and decreases from left to right across a period.
  • Thus, helium is the smallest element, and francium is the largest.
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