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NEET Chemistry QUESTION #7409
Question 1
Which of the following statements about atomic properties is WRONG?
  • Atomic radius increases as one moves down the first group
  • Atomic radius decreases from left to right across the second period
  • Among isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius✔️
  • Among isoelectronic species, greater the negative charge on the anion, larger is the ionic radius
Correct Answer Explanation
Isoelectronic species and ionic radius:
For cations with the same number of electrons, a larger positive charge means more protons pulling the same electrons — smaller radius. So smaller positive charge → larger ionic radius (not smaller). Option (3) reverses this logic and is therefore wrong.

Options (1), (2), and (4) are correct periodic trend statements.