Rubidium, Rb, is a Group I element. It has similar physical and chemical properties to the other elements in Group I.
Predict how many electrons there are in the outer shell of a rubidium atom.
Predict one physical property of rubidium which is the same as that of a transition element such as iron.
Predict two physical properties of rubidium which are different to those of a transition element such as iron.
When rubidium is added to cold water a reaction occurs.
i) Suggest two observations that would be made when rubidium is added to cold water.
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ii) What would be the colour of the solution if methyl orange was added to it after the reaction?
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iii) Write a chemical equation for the reaction between rubidium and water.
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iv) Put the Group I elements, caesium, lithium, potassium, rubidium and sodium in their order of reactivity with water, from the most reactive to the least reactive.
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v) Suggest one safety measure that should be used when rubidium is added to cold water.
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Extended Only
The phosphate ion has the formula PO43–. Deduce the formula of rubidium phosphate.
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