Chemistry S & P Block Elements ETEA 2022
PMDC Verified Question 54 of 104
A radius greater than its parent atom is called:
A
Cationic radii
B
Atomic radii
C
Covalent radii
D
Anionic radii
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Anionic radii
Concept:

The size of an ion relative to its parent neutral atom depends on whether it has gained or lost electrons.

Solution:

  • When a neutral atom gains an electron to form a negative ion (anion), the number of electrons in the valence shell increases while the nuclear charge (protons) remains exactly the same.
  • This added electron increases electron-electron repulsion within the valence shell, causing the electron cloud to expand outward.
  • As a result, the anionic radius is always greater than the radius of its parent atom.
  • General Order: Anion > Parent Atom > Cation.


Why other options are incorrect:

  • Cationic radii: Cations are formed by losing electrons, making them strictly smaller than their parent atoms.

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