Electron microscopy
Argon (Ar)
- Practical Electron Microscopy and Database -
- An Online Book -
Microanalysis | EM Book                                                                                   http://www.globalsino.com/EM/        

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.


The electronic configuration of Ar is 1s2 2s2 2p6 3s2 3p6. Because the third energy level has eight electrons (full), it is called a Nobel Gas.

As listed in Table 3217, substances with large bonding energies usually have high melting temperatures.

Table 3217. Bonding energies and melting temperatures of van der Waals bonding-type substances.

Bonding type

Bonding energy
Melting point (°C)
kJ/mol kcal/mol eV/Atom, Ion, or Molecule
van der Waals
Typical value 0.1-10      
Ar 7.7 1.8 0.08 -189
Cl2 31 7.4 0.32 -101



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