Why in periodic table normally we have elements with FCC and HCP structure?

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SUMMARY

The discussion centers on the atomic arrangement principles in the periodic table, specifically focusing on the Face-Centered Cubic (FCC) and Hexagonal Close-Packed (HCP) structures. Atoms tend to arrange themselves to minimize energy, which is effectively achieved through close packing in FCC and HCP configurations. However, certain elements exhibit stability in Body-Centered Cubic (BCC) structures due to specific electronic structure details, with alpha polonium being a notable example of an element that stabilizes in a simple cubic structure.

PREREQUISITES
  • Understanding of atomic structure and bonding principles
  • Familiarity with crystal lattice structures, specifically FCC, HCP, and BCC
  • Knowledge of energy minimization concepts in materials science
  • Basic principles of solid-state physics
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  • Research the properties and applications of FCC and HCP structures in materials science
  • Study the electronic structure of elements that stabilize in BCC and simple cubic configurations
  • Explore the role of energy minimization in crystal formation and stability
  • Learn about the implications of atomic arrangements on material properties and behaviors
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Materials scientists, physicists, and chemists interested in atomic structure, crystal formation, and the properties of elements in the periodic table.

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what is basic principle followed by atoms to arrange in basic structure?
 
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Minimizing the energy as much as possible! Close packing as in HCP and FCC seems to do the job very well. However, for some elements due to subtle electronic structure details, minimizing the energy stablizes BCC and in one case (alpha polonium) stablizes the simple cubic structure.
 
Thread 'Unexpected irregular reflection signal from a high-finesse cavity'

Thread 'Unexpected irregular reflection signal from a high-finesse cavity'

I am observing an irregular, aperiodic noise pattern in the reflection signal of a high-finesse optical cavity (finesse ≈ 20,000). The cavity is normally operated using a standard Pound–Drever–Hall (PDH) locking configuration, where an EOM provides phase modulation. The signals shown in the attached figures were recorded with the modulation turned off. Under these conditions, when scanning the laser frequency across a cavity resonance, I expected to observe a simple reflection dip. Instead...
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