the two elements requires more sophisticated analysis, such as spectroscopy.

Chemical properties

Rubidium is the second most electropositive of the stable alkali metals and has a very low first ionization energy of only 403 kJ/mol. It has an electron configuration of [Kr]5s¹ and is photosensitive. Due to its strong electropositive nature, rubidium reacts explosively with water to produce rubidium hydroxide and hydrogen gas.

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