Rubidium (Rb) is an alkali metal with an atomic number of 37, and it has one electron in its outermost shell. In reactions, Rb is likely to lose this single valence electron to achieve a stable noble gas configuration, similar to krypton (Kr), which has 36 electrons. Therefore, when Rb forms ions, it typically adopts a +1 charge, resulting in the Rb⁺ ion.
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