Which of the following element has the highest ionization energy.
Correct answer: C. N
- A. O
- B. C
- C. N
- D. Be
Explanation
Ionisation energy is the quantity of energy needed to remove an electron from an atom. The ionisation energy of an atom is directly proportional to the effective nuclear charge of an atom/ion. Hence, ionisation increases left to right in a period and is observed to be highest for noble gases. Also, there is an exception in the ionization energy trend for the 2nd and 5th groups due to half-filled orbitals, which have extra stability, so more energy is required to remove electrons. Hence the order is N>O>C>Be.The order of ionization energy in periods is:I-A<III-A<II-A<IV-A<VI-A<V-A<VII-A<VIII-A
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