Question

why radii of negative ions are larger than the size of their parent atoms​

Answer 1

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Consider first the relative sizes of an ion and its parent atom. ... The opposite is true of negative ions. When electrons are added to form an anion, the increased electron-electron repulsions cause the electrons to spread out more in space. Thus, anions are larger than their parent atoms.

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Answer 2

Answer:

Because positive ions have stronger pulls on their electrons.

Explanation:

Electrons are negatively charged while protons are positively charged and they both exert pulls on each other. Negatively charged ions have higher negative charges within them, thus causing the electrons to spread out and move away from the nucleus much like how like magnets repel. Likewise, Positively charged ions have stronger positive charges within them and pull their electrons closer to them much like how magnets attract. Therefore, when an atom becomes a positive ion is pulls its electrons closer, decreasing is radius moreover, when it becomes a negative ion, it pulls its electrons closer and decreases the radius.