Na+ is smaller than Na atom because:

The total number of electrons is 10 in the case of Na+ and 11 in the case of Na, while the number of protons is the same, i.e. 11 in both cases. Sodium is a Group 1 element, so its only ionic state is Na+. Cations of a given element have a smaller radius than the neutral atom so that Na+ will decrease in size compared with the Na atom.

  • Sodium atoms and sodium ions have the same number of protons.
  • Each one has 11 protons. This is because the atomic number of sodium is 11.
  • The sodium atom has 11 electrons.
  • Sodium-ion has 10 electrons as sodium atom loses one electron to form sodium ion.
  • Only sodium atom react vigorously with water whereas sodium ion does not.

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