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JEE Main 201912 JanuaryEvening Shift
Exam
JEE Main
Year
2019
Date
12 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2019 · 12 January · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

The correct order of atomic radii is:

The correct order of atomic radii is:

Options

  1. ACe>Eu>Ho>N\text{Ce>Eu>Ho>N}
  2. BN>Ce>Eu>Ho\text{N>Ce>Eu>Ho}
  3. CHo>N>Eu>Ce\text{Ho>N>Eu>Ce}
  4. DEu>Ce>Ho>N\text{Eu>Ce>Ho>N}

Correct answer

D. Eu>Ce>Ho>N\text{Eu>Ce>Ho>N}

Step-by-step solution

As the number of electrons are increased it increases the radius of the element. As the number of protons are increased the radius is decreased.

As we can see:

Radius of :

Eu=199pmCe=183pmHo=176pmN=170pmEu = 199pmCe = 183pmHo = 176pmN = 170pm

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