if I took two electrons (negatively charged particles) and tried to put them near each other, what would happen?

How many moles are in 43.9 l of oxygen

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)

Which sample at stp has the same number of atoms as 18 liters of ne at stp