Question:
Which of the following is not the correct order of atomic radius of the elements given?
Which of the following is not the correct order of atomic radius of the elements given?
Show Hint
Remember that transition metal radii decrease across a period due to poor shielding of d-electrons, while main group element radii follow periodic trends dominated by shell number and effective nuclear charge.
Updated On: Jun 9, 2026
- \(Br < Ge < Ga < Ca\)
- \(Cr < V < Ti < Sc\)
- \(F < Cl < K < Cs\)
- \(O < P < K < Ge\)
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
Atomic radius generally increases down a group due to the addition of new shells and decreases across a period due to increasing effective nuclear charge.
Step 1: Evaluate the given orders.
(A) \(Br < Ge < Ga < Ca\): Correct. These elements are in the 4th period. As we move left (Ca to Br), atomic radius decreases.
(B) \(Cr < V < Ti < Sc\): Correct. In the 3d transition series, as the atomic number increases from Sc to Cr, the effective nuclear charge increases, causing a decrease in atomic radius.
(C) \(F < Cl < K < Cs\): Correct. F and Cl are in Group 17, and K and Cs are in Group 1. Radii increase down the groups.
(D) \(O < P < K < Ge\): Incorrect. O (\(r \approx 60\) pm), P (\(r \approx 110\) pm), K (\(r \approx 227\) pm), Ge (\(r \approx 122\) pm). The correct order should place Ge after P and before K. \[ \boxed{O < P < K < Ge} \]
Step 1: Evaluate the given orders.
(A) \(Br < Ge < Ga < Ca\): Correct. These elements are in the 4th period. As we move left (Ca to Br), atomic radius decreases.
(B) \(Cr < V < Ti < Sc\): Correct. In the 3d transition series, as the atomic number increases from Sc to Cr, the effective nuclear charge increases, causing a decrease in atomic radius.
(C) \(F < Cl < K < Cs\): Correct. F and Cl are in Group 17, and K and Cs are in Group 1. Radii increase down the groups.
(D) \(O < P < K < Ge\): Incorrect. O (\(r \approx 60\) pm), P (\(r \approx 110\) pm), K (\(r \approx 227\) pm), Ge (\(r \approx 122\) pm). The correct order should place Ge after P and before K. \[ \boxed{O < P < K < Ge} \]
Was this answer helpful?
0
0
Top AP EAPCET Chemistry Questions
- The four quantum numbers of the valence electron of potassium are :
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
- In which of the following the election gain enthalpy of elements is correctly arranged?
- The radii of $ \text{F,}{{\text{F}}^{-}}\text{O} $ and $ {{\text{O}}^{2-}} $ are in the order
- Which of the following has the highest first ionization potential?
View More Questions
Top AP EAPCET Periodic Trends In Properties Of Elements Questions
- Which of the following is not correct with the property mentioned against them?
- The correct order of atomic radii of Al, Ga, In, Tl is
- The alkaline earth metal with lowest density is
- Which of the following statements are correct?
- The correct order of electron gain enthalpy of N, O, Cl, Al is.
View More Questions
Top AP EAPCET Questions
- A body is projected from the ground at an angle of $\tan^{-1} \left( \frac{8}{7}\right)$ with the horizontal. The ratio of the maximum height attained by it to its range is
- The four quantum numbers of the valence electron of potassium are :
- A lens forms real and virtual images of an object, when the object is at $u_{1}$ and $u_{2}$ distances respectively. If the size of the virtual image is double that of the real image, then the focal length of the lens is (take, the magnification of the real image as $m$ )
- Two spheres $P$ and $Q$, each of mass $200\, g$ are attached to a string of length one metre as shown in the figure. The string and the spheres are then whirled in a horizontal circle about $O$ at a constant angular speed. The ratio of the tension in the string between $P$ and $Q$ to that of between $P$ and $O$ is $(P$ is at mid-point of the line joining $O$ and $Q$ )
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
View More Questions