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Question

Which of the following elements will have the largest atomic radii?


A

Cl

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B

Br

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C

K

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D

Na

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Solution

The correct option is C

K


Explanation for the correct option:

(c ) K

  • Across the periodic table, atomic radii fluctuate predictably. The atomic radius grows from top to bottom in a group and diminishes from left to right across a period. As the atomic number increases over time, so does the nuclear charge, and therefore the nuclear force of attraction. As a result, atomic radius reduces over time.
  • Among the elements stated above, Na and Cl correspond to the third phase. K and Br, on the other hand, are from the fourth period.
  • Because the third period is below the second period, it will have a bigger atomic radius than the second period.
  • Furthermore, K is on the left side of the periodic table, while Br is on the right.
  • Hence K has the largest atomic radius of the above-mentioned elements.
  • Hence this option is correct

Explanation for the incorrect options:

(a) Cl

  • Among the elements stated above, Na and Cl correspond to the third phase. K and Br, on the other hand, are from the fourth period.
  • Fourth-period elements will have larger radii than third-period elements.
  • Thus, this option is incorrect.

(b) Br

  • K and Br, on the other hand, are from the fourth period.
  • K is on the left side of the periodic table, while Br is on the right
  • Br will have lesser radii than K
  • Thus, this option is incorrect.

(d) Na

  • Among the elements stated above, Na and Cl correspond to the third phase. K and Br, on the other hand, are from the fourth period.
  • Fourth-period elements will have larger radii than third-period elements.
  • Thus, this option is incorrect.

Hence the correct option is (c ) K


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