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This is a list of the various reported boiling points for the elements, with recommended values to be used elsewhere on Wikipedia. For broader coverage of this topic, see Boiling point . Boiling points, Master List format
For instance, when moving down the table, all known alkali metals show increasing atomic radius, [71] decreasing electronegativity, [71] increasing reactivity, [5] and decreasing melting and boiling points [71] as well as heats of fusion and vaporisation.
The melting (98 °C) and boiling (883 °C) points of sodium are lower than those of lithium but higher than those of the heavier alkali metals potassium, rubidium, and caesium, following periodic trends down the group. [12]
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The temperature at standard pressure should be equal to the normal boiling point, ... and Transport Properties of Alkali Metals, ... Table 363, Evaporation of Metals
Rubidium is the second most electropositive of the stable alkali metals and has a very low first ionization energy of only 403 kJ/mol. [12] It has an electron configuration of [Kr]5s 1 and is photosensitive.
Boca Raton, Florida, 2003; Section 6, Fluid Properties; Critical Constants. Also agrees with Celsius values from Section 4: Properties of the Elements and Inorganic Compounds, Melting, Boiling, Triple, and Critical Point Temperatures of the Elements Estimated accuracy for Tc and Pc is indicated by the number of digits.
In the periodic table, potassium is one of the alkali metals, all of which have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge (which combines with anions to form salts). In nature, potassium occurs only in ionic salts.