Determine the number of electrons rubidium must lose to obtain a noble gas configuration and identify the noble gas that corresponds to the configuration.

• A. Rubidium (Rb) must lose one electron to achieve a noble gas configuration corresponding to krypton (Kr).
• B. Rubidium (Rb) must lose two electrons to achieve a noble gas configuration corresponding to krypton (Kr).
• C. Rubidium (Rb) must lose one electron to achieve a noble gas configuration corresponding to xenon (Xe).
• D. Rubidium (Rb) must lose two electrons to achieve a noble gas configuration corresponding to xenon (Xe).

Answer: (A)