Quantum Numbers
Among the following, which species has the highest first ionization energy?
Select the correct option:
Solution
Ne
- Definition: Ionization energy is the energy required to remove the most loosely bound electron from a neutral gaseous atom.
- Periodic Trends: IE generally increases across a period (left to right) due to increasing effective nuclear charge (Zeff) and decreasing atomic radius.
- Special Cases: Noble gases (like Neon) have completely filled shells, resulting in extreme stability. Breaking this configuration requires exceptionally high energy.
- Comparison: Within Period 2: Li<B<Be<C<O<N<F<∗∗Ne∗∗. Note N>O due to the stable half-filled p3 configuration, but Ne is significantly higher than all of them.
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About This Question
- Subject
- chemistry
- Chapter
- atomic structure
- Topic
- quantum numbers
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Ne
- Definition: Ionization energy is the energy required to remove the most loosely bound electron from a neutral gaseous atom.
- Periodic Trends: IE generally increases across a period (left to right) due to increasing effective nuclear charge (Zeff) and decreasing atomic radius.
- Special Cases: Noble gases (like Neon) have completely filled shells, resulting in extreme stability. Breaking this configuration requires exceptionally high energy.
- Comparison: Within Period 2: Li<B<Be<C<O<N<F<∗∗Ne∗∗. Note N>O due to the stable half-filled p3 configuration, but Ne is significantly higher than all of them.
This medium difficulty chemistry question is from the chapter atomic structure, covering the topic of quantum numbers. It appeared in the 2025 exam.
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