Select from group the species which has the smallest radius stating

1.	Select from group the species which has the smallest radius stating appropriate reason: O, O-, O2-
Answer» O has the smallest radius. Reason: An anion is formed when a neutral gaseous atom gains one or more electrons. This increases the number of electrons in the anion while its nuclear charge remains the same as that on the neutral atom. Since the same nuclear charge now attracts greater number of electrons of all the shells decreases. Hence the electron cloud of the atom expands. Hence O has small radius among O, O^- and O^2-

Select from group the species which has the smallest radius stating appropriate reason: O, O-, O2-

Answer»

O has the smallest radius.

Reason: An anion is formed when a neutral gaseous atom gains one or more electrons. This increases the number of electrons in the anion while its nuclear charge remains the same as that on the neutral atom. Since the same nuclear charge now attracts greater number of electrons of all the shells decreases. Hence the electron cloud of the atom expands. Hence O has small radius among O, O^- and O^2-

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Select from group the species which has the smallest radius stating appropriate reason: O, O-, O2-

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