Electronic Transitions and Spectroscopy
The term “electronic” connotes electron, and the term “transition” implies transformation. In a molecule, the electrons move from a lower to a higher energy state due to excitation. The two energy states, the ground state and the excited state are the lowest and the highest energy states, respectively. An energy change is observed with this transition, which depicts the various data related to the molecule.
Photoelectron Spectroscopy
Photoelectron spectroscopy (PES) is a part of experimental chemistry. It is a technique used in laboratories that involves projecting intense beams of radiation on a sample element. In response, the element ejects electrons for which the relative energies are measured.
![### Educational Exercise: Order of Ionic and Atomic Sizes
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**Exercise A**
**Task:** For the following group, place the atoms and/or ions in order of decreasing size.
- **Items to Arrange:** P⁻, P²⁻, P³⁻
**Diagram:**
- **Decreasing size:**
- P³⁻ (largest)
- P²⁻
- P⁻ (smallest)
**Instruction:** Drag and drop your selection from the following list to complete the answer.
**Input Box:** [ ]
**Submit Button:** [Submit]
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**Exercise B**
**Task:** For the following group, place the atoms and/or ions in order of decreasing size.
- **Items to Arrange:** Ne, O²⁻, Mg²⁺
**Diagram:**
- **Decreasing size:**
- O²⁻ (largest)
- Ne
- Mg²⁺ (smallest)
**Instruction:** Drag and drop your selection from the following list to complete the answer.
**Input Box:** [ ]
**Submit Button:** [Submit]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F33117b1d-8c67-4182-9c7f-c2461329de55%2Fae2c52c7-0d0c-440b-9f17-bae3f16da6aa%2Frvv129e.jpeg&w=3840&q=75)
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