Predict the number of electrons in the outer shell of a rubidium atom.
Predict one physical property of rubidium that is the same as that of a transition element such as iron.
Predict two physical properties of rubidium that are different from those of a transition element such as iron.
Suggest two observations that would be seen when rubidium is added to cold water.
What colour would methyl orange turn if it were added after the reaction?
Write a chemical equation showing the reaction between rubidium and water.
Put the Group I elements, caesium, lithium, potassium, rubidium and sodium, into order of reactivity with water. Place the most reactive element first.
Suggest one safety measure that should be used when rubidium is added to cold water.
Deduce the formula for rubidium phosphate.