Sodium metal and sodium chloride are both solid at room temperature. Using details of their bonding and structure, explain why as a solid, sodium metal conducts electricity whereas sodium chloride does not.

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)