I would really like some help with the mechanism of this synthesis of varenicline. I understand the first step with the NBS, but I don't understand the rest of the steps. Can somebody please help me?​

Which other elements contain the same number of outer electrons as sodium

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)

The time that is taken by neptune once around the sun is called