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argon Explore an interactive periodic table of the elements argon isolation first ionization energies of the elements Figure 1: Phase diagram of argon. Figure 1: The four stable geometric structures of the seven-atom cluster of argon, in order of increasing energy: (A) A pentagonal bipyramid. (B) A regular octahedron with one face capped by the seventh atom. (C) A regular tetrahedron with three of its faces capped by other atoms. (D) A trigonal bipyramid with two of its faces capped by other atoms; although this has the highest energy of the four structures, it is very close in energy to the tricapped tetrahedron. Figure 2: The four lowest-energy structures of the 13-atom cluster of argon.
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Also Known As Ar

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argon
argon isolation
first ionization energies of the elements
Figure 1: Phase diagram of argon.
Figure 1: The four stable geometric structures of the seven-atom cluster of argon, in order of increasing energy: (A) A pentagonal bipyramid. (B) A regular octahedron with one face capped by the seventh atom. (C) A regular tetrahedron with three of its faces capped by other atoms. (D) A trigonal bipyramid with two of its faces capped by other atoms; although this has the highest energy of the four structures, it is very close in energy to the tricapped tetrahedron.
Figure 2: The four lowest-energy structures of the 13-atom cluster of argon.
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Key People

William Ramsay
Sir William Ramsay
British chemist
Lord Rayleigh, engraving by R. Cottot.
Lord Rayleigh
British scientist

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