![]() This is especially problematic for francium, which by relativistic calculations can be shown to be less electronegative than caesium, but for which the only value (0.7) in the literature predates these calculations. Many of the highly radioactive elements have values that must be predictions or extrapolations, but are unfortunately not marked as such.The suggested values are all taken from WebElements as a consistent set. ![]() Electronegativity is not a uniquely defined property and may depend on the definition.Separate values for each source are only given where one or more sources differ.The Inaccessible Earth: An integrated view to its structure and composition. However, francium is expected and, to a small extent, observed to be more electronegative than caesium. The base value of hydrogen was later increased by 0.10 and caesium's electronegativity was later refined to 0.79 however, no refinements have been made for francium as no experiment has been conducted. ^ The electronegativity of francium was chosen by Pauling as 0.7, close to that of caesium (also assessed 0.7 at that point).There are no reliable sources for Pm, Eu and Yb other than the range of 1.1–1.2 see Pauling, Linus (1960). ![]() See also: Electronegativities of the elements (data page) → Atomic radius decreases → Ionization energy increases → Electronegativity increases →
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