Rubidium is below potassium in Group 1 of periodic table
(a) state the formula of a rubidium ion.
(b.1) rubidium and potassium both react in cold water
Suggest one difference in the way that they react
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(a) Rb⁺⁺ (++ is 2+)
(b) potassium floats in water, while rubidium sinks.
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