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Question

Which one of the following depicts the correct representation of the atomic radius(r) of an atom?


A

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B

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C

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D

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Solution

The correct option is C


Explanation for correct option

(B) and (C)

Trend of atomic radius in the Periodic Table

  • In general, the atomic radius reduces from left to right in a period, and from top to bottom in a group, it increases.
  • In some exceptional cases, such as the oxygen radius is slightly bigger than the nitrogen radius.

Atomic radius

  • The atomic radius of a molecule is equal to half the distance between adjacent atoms of the same element.
  • As electrons are added to the same principal energy level, protons are added to the nucleus.
  • In (B) and (C), the atomic radii are accurately shown as the distance between the nucleus and the valence electron shell.

Explanation for incorrect options

  • Figures (B) and (C) are the correct representation of the atomic radius(r) of an atom
  • Hence all other options (A) and (D) are incorrect.

Therefore, the correct option are (B) and (C).


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