Fajans' rules
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In inorganic chemistry, Fajans' rules, formulated by Kazimierz Fajans in 1923, are used to predict whether a chemical bond will be covalent or ionic, and depend on the charge on the cation and the rel
Graph of percentage ionic character
Noble gas
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The noble gases are the members of group 18 of the periodic table: helium, neon, argon, krypton, xenon, radon and, in some cases, oganesson. Under standard conditions, the first six of these elements
Fajans' rules
…holds on to its valence electrons. Therefore, large size of the anion leads to high polarizability of the anion. Valence electronic configuration:The noble gas configuration in a cation offers better shielding and thus less polarizing power. This creates exceptions, for example Hg2+ despite having lesser charge…
Thanks to its characteristic spectral lines, Helium was discovered to exist on the Sun before it was discovered on Earth.
Liquid helium is used to cool superconducting magnets in modern MRI scanners.
Goodyear Blimp
15,000-watt xenon short-arc lamp used in IMAX projectors