Which of the following is the correct relation for atomic radius?
Correct answer: A. A⁻ > A > A⁺
- A. A⁻ > A > A⁺
- B. A > A⁺ > A⁻
- C. A⁺ > A > A⁻
- D. A⁻ > A⁺ > A
Explanation
An anion (A⁻) is larger than its neutral atom (A) because the added electron increases electron-electron repulsion. A cation (A⁺) is smaller than its neutral atom because there are fewer electrons being pulled by the same number of protons, and often an entire electron shell is lost.
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Chemical bonding explains molecular shape through VSEPR theory and distinguishes sigma bonds from pi bonds. Questions involve hybridization, bond angles, dipole moment and bond energy, including how electron-pair repulsion determines geometry and how bond polarity differs from the overall polarity of a molecule.
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