1.

Which of the following has the smallest size (a) Na (b) Na+ (c) Na- (d) Cl+​

Answer»

Among the given species, Cl⁺ has the SMALLEST size.

  • As we MOVE across the period, the value of the atomic RADII of ATOMS decreases, hence the size of the atom becomes smaller.
  • Since cations are smaller than the size of the atoms and anions are larger than the atoms, Na⁺ will be smaller than Na while Na⁻ will be larger compared to Na. Similarly, Cl⁺ will be very small.
  • So, Cl⁺ will be the smallest ion among the given species.


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