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JAMB Chemistry 1999 Question 10

Question 10

Periodic Table

In order to remove one electron from a 3s-orbital of gaseous sodium atom, about 496 kJ mol−1 of energy is required. This energy is referred to as

  1. A.electron affinity
  2. B.ionization energy
  3. C.activation energy
  4. D.electronegativity
Show the answer and explanation

Answer: B (ionization energy)

Explanation

The energy needed to remove an electron from a gaseous atom to form a positive ion is the (first) ionization energy.