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Rubidium has a full outer shell (octet) if it loses one electron, forming a 1+ ion. To form a 2+ ion it would have to lose two electrons anf fall and electrons short of a full octet, which is not very stable, especially for a positive ion.

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Do Acids react with compounds containing hydroxide ions to form water and salt?

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Rubidium hydroxide is considered a strong base because it dissociates completely in water to form hydroxide ions. This results in a high concentration of hydroxide ions in solution, making it a strong base.