First ionization enthalpy is the energy required to remove the outermost electron from a neutral gaseous atom. - Across a period, ionization enthalpy generally increases due to increasing nuclear charge and decreasing atomic radius. - Exceptions occur due to stable electronic configurations: - Elements with filled s subshells (e.g., Be) have higher ionization enthalpies than their neighbors with partially filled p subshells (e.g., B). - Elements with half-filled p subshells (e.g., N) have higher ionization enthalpies than their neighbors with partially filled p subshells that are not half-filled (e.g., C and O). However, N is an exception where its ionization energy is higher than O.
The correct increasing order of first ionization enthalpy of second period elements is - (1) $ \text{Li} < \text{B} < \text{Be} < \text{C} < \text{O} < \text{N} < \text{F} $ (2) $ \text{Li} < \text{B} < \text{Be} < \text{C} < \text{O} < \text{F} < \text{N} $ (3) $ \text{Li} < \text{B} < \text{Be} < \text{C} < \text{N} < \text{F} < \text{O} $ (4) $ \text{Li} < \text{Be} < \text{B} < \text{C} < \text{N} < \text{O} < \text{F} $ (5) Question not attempted
Asked in Department Recruitment 2024 (Chemist) 2024 · Topic: Atomic Structure (Electronic Configurations of Multi-electron Atoms and Ions)
Show answer
Answer: D. $ \text{Li} < \text{Be} < \text{B} < \text{C} < \text{N} < \text{O} < \text{F} $
More Chemistry questions
- The correct electronic configuration for V is
- Arrange the ions Ce³⁺, La³⁺, Pm³⁺ and Yb³⁺ in the increasing order of their size. - (5) Question not attempted
- In which diatomic molecule consists of only pi (π) bond/s? - (5) Question not attempted
- The molecular geometry of Cl/F3 is
- In O$_2^-$, the bond order is
- What is the mass of 3.011×1023 number of N atoms?
- The number of moles in 52 g of He is - 3
- Which of the following is diamagnetic?