Why are anions larger than their parent atom?
Answers
anions have negative charge on them that means more no of electrons than protons
therefore there will be weaker attraction on more no. of electrons by positive nucleus , also there will be more interelectronic repulsion , these all will tend to increase the radius of anion.
hence anions are larger than their parent atom
Answer:
(1) An anion is formed by the acceptance of an electron by a parent atom.
A + e^- → A^-
(2) The nuclear charge in a parent atom and its anion is same.
(3) The additional electron in an anion, results in the repulsion among the electrons and results in the decrease in effective nuclear charge, as compared to the parent atom. Therefore, the radius of an anion is larger than its parent atom. For example, F atom has atomic radius 64 pm while anion F has ionic radius 136 pm