Consider the following statements:I. The radi | vedclass

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(C) $I.$ Correct. An anion is formed by the gain of electrons,which increases electron-electron repulsion and decreases the effective nuclear charge p

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$I$ and $II$

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(C) $I.$ Correct. An anion is formed by the gain of electrons,which increases electron-electron repulsion and decreases the effective nuclear charge per electron,leading to a larger ionic radius compared to the parent atom.$II.$ Correct. Across a period,the atomic size decreases due to an increase in effective nuclear charge,making it harder to remove an electron,thus increasing the ionization energy.$III.$ Incorrect. Electronegativity is defined as the tendency of an atom in a chemical compound to attract a shared pair of electrons,not an isolated atom.

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