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.
Match the species on the left (a-e) with their corresponding colors on the right (1-5):
a) Hg2Cl2 1. Green
b) PbCrO4 2. Black
c) NiS 3. Yellow
d) (NiCl4)2- 4. Brown
e) Fe(OH)3 5. White
Answer: Hg2Cl2 is white in color.
PbCrO4 is yellow in color .It is used in paints and pigments.
NiS is black in color .It is formed by passing H2S gas.
(NiCl4) 2- is green in color as it is paramagnetic species we can check its configuration by filling electrons in tetrahedral splitting field diagram.
Fe(OH)3 is brown in color.
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